This will contain descriptions of both UPG in the form of Ankow and writings about Her, and general mentions of death and funeral customs. Proceed with these in mind!
Starting out with Ankow - a figure mentioned in passing as the embodiment of death with analogous figures sharing a root in both Breizh/Brittany (Ankou) and Cymru/Welsh (Angau). Ankow is variously described as a classic "Grim Reaper", a figure with a cloak and hat that conceals Their face, an elderly woman or simply a shadow. In my own personal experiences with Ankow and revering Her as the eventual end to all things, I've only connected with the image of an elderly woman but, as true of any deity, She is likely to appear however She feels fits.
Similarly, there are descriptions of Ankow as a masculine figure! They can all be simultaneously true (as with the Bucca, though that is much more 'literal' as the divine androgyne), but for the purposes of this article I'm going to refer to Ankow with She/Her (else I'll confuse myself too). Ankow as a bringer of death has never rung true in my experience, just as a hospice nurse doesn't kill their charge. Ankow cares for and guides someone through the veil, to Nevek, without being the cause of their death or 'stealing' them away. Ankow comes with a cart and a mare pulling it to escort someone through, coming with a smile and gentle hands. Her role and typing as a 'hag' is true in the sense of being an older woman with vast knowledge. I have found Her to be grandmotherly, never rushing ahead of Herself but never lagging in her tasks.
Ankow is generally not a deity or figure to be prayed too outside of a death in the family or community, but Her role also bestows Her with rule of transformations and purification. As such I have called for her help in ritual purification ceremonies and kept Her as a figure in thought for rites of passage. I would hesitate to invoke, or advise anyone else to, invoke her as I'm sure that the figure of death has better things to do with Her time than attend to the living (besides, a lot of aspects that'd require her invoking are present in the much more happy to oblige Bucca).
Cornish death customs are largely lost to history or merged into English practice (partly as a result of Christianity). In a general pre-historic "death in Cornwall" sense, there are barrows and ancient neolithic burials scattered across the county (particularly in Penwith) that have been rich with archeological evidence. Of particular note (because I've been there) is Bosiliack Barrow - aligned with the Winter Solstice sunrise & with offerings of topsoil within the sealed tomb it's highly likely both have ritual significance. It has a lot of ancestral spirits, and I go slightly more in-depth here.
Speeding through time to the 1800s, death in Cornwall was a community affair. The community in this sense far exceeded the immediate community - it encompassed many miles around as written in a newspaper article from the 1890s [source].
Perhaps there is no event among these people more illustrative of character, traits ami the peculiar cherishing of mournful customs than the Cornish funeral. No work is done for half a score of miles roundabout, on funeral days. All festive or political occasions fail to draw together such Cornish crowds as the burial of the lowliest man or woman of Cornwall. The assemblages never number loss than many hundreds, and usually comprise many thousands of "Cousin Jacks," as all Cornishmen are called, and all call each other; while the burial of a Cornish farmer, miner or fisherman will often attract far greater crowds than that of the greatest and noblest lord. To illustrate this singular outpouring on funeral occasions, in 1870 the body of a Praze miner who had emigrated to Colorado and had been accidentally killed in one of the mines of that State was brought back hero for burial. The entire population of Cornwall is less than a half million souls, yet more than 100,000 Cornish folk attended this funeral.
The article goes on to detail that Cornish towns and hamlets generally had a carpenter and joiner and their apprentices as the undertaker and assistance. Their shop would contain "funeral tackle", everything necessary for the occasion, and that the role was generally inherited from father to son and so on. Naturally, any items or tools used in undertaking were considered both incredibly sacred and the object of many superstitions. An undertaker would make the coffin (colloquially a 'box') and because at the time (and still today) Cornwall is a poor county and as only the rich and noble could afford horses, the dead would be transported by the undertakers helpers as there was no small dread in coming into contact with the deceased or any item relating to them.
The coffin would be carried to the deceased in their home, taken through whatever entrance would fit it (but it could only go through feet first, any other way could bring another death onto the family). The deceased would have been part of the ceremony in a very specific (though separate) way - the relatives, neighbours, friends and anyone that knew them would come to the house, sit in the living space away from the body, drink and reminisce about both them and the various legends of their area. This was (and still is!) called watching the dead. The funeral ceremony is best summed up by the same article from earlier (corrections made to spelling my own)
Thousands of folk, all in black, gather to escort the dead and mourners. Here again the importance of the undertaker is observed. He has selected a voluntary choir from the crowd. He appoints the EIGHT "BIERERS" OR BEARERS. He brings two chairs from the house and sets them in the highway. The coffin is deposited on these. Then he arranges the "bierers" and the curious "coffin-tackle." This consists of two polished hectagon sticks, four feet long, and round at the ends; and four stout linen "napkins," two feet wide and three yards long. Two of those are passed through the rope handles, one at each coffin-end, knotted, and the sticks are passed through these knots, providing supporting handles for "bierers"— two at the head and two at the foot. Four other "bierers"—two on each side—assist in carrying the coffin, by passing two napkins - under the coffin, and the ends up through the side handles; for it should be remembered that the burden must literally be carried often for many miles, and never once set upon the ground, although, from another ancient custom, chairs will lie seen set outside every house along the funeral way. A dirge is sung while the mourners are being disponed in due order. Then the undertake reads the first two lines of that most lugubrious and solemn of all Wesleyan hymns
Where'er we po, where'er we be, Were' marc-lut- to the grave!—
Which is the signal for wailing on the part of the mourners, weird and plaintive chanting by the choir, though no others are allowed to lift their voices, and for the slow and measured departure of the doleful cortege. All along the way the undertaker is proudly conducting his functions. He selects helpers who relieve the regular "bierers," though the latter must always be in their places when passing a village. And it would not be a Cornish funeral If be did not command the choir to sing "Where'er We Go," as every hamlet or little collection of houses was approached; if every person overtaken upon the way did not join the cortege and accompany it for some distance; if any one coming toward the procession did not instantly turn backward on its discovery; if the choir did not use its utmost powers as the parish church was finally reached; If the cortege failed to halt a respectful distance from the church door until the "passon" and sexton had made their appearance, wholly outside the entrance, to receive it; If all the women did not wail and weep during the entire service; if the "passon," sexton and undertaker were not paid for their services at the grave in "coin in the presence of the entire multitude; if hundreds of "Cousin Jacks" and "Cousin Jinnies " did not return to the bereaved home to participate In sympathetic reminiscence, saffron-cake, beer and liquor; and if the departed's "pairdnets" and cronies, including the undertaker with his "helpers" and "bierers," did not repair to the public house to indulge in toddy, boiled beer, or "shneagrum"— a Cornish drink ol beer, brandy, sugar and lemon— and during tlie eventful night ten thousand times praise their late comrade with the highest eulogy one Cornish man can bestow upon another: "All, Coden Jack's gone, you. Ah, cc knowed tin, did Coden Jack!"
Cornish mourning is (and was) a loud affair with alcohol - as all good Cornish occasions are. In the current year and day, funeral care has been become very "samey" amongst white English and it's played no small part in the slow erosion of Cornish customs. There are multiple family-inherited undertakers fighting to bring the older ways back to the forefront, rightly arguing that the treatment of the passed on is intensely important part of culture. Below are some links to current Cornish funeral revivals, historic barrows, and anything else I thought interesting!
https://www.cornwalllive.com/news/cornwall-news/coronavirus-sparks-revival-old-funeral-4050368
https://www.historic-cornwall.org.uk/flyingpast/living.html
http://cornishstory.com/2020/10/08/sacred-places/
also posted on https://pysksos.blogspot.com/2021/10/death-and-her-customs.html
