This has gotta be one of my favourite photos of Sir Nigel Gresley for a litany of reasons the first being the fact that its a fun rebuttal to the whole duck thing.
Like I'm not doubting that Gresleys own grandchildren knew him better than the wider world, what I will point out though is:
Gresley is hand feeding these ducks, Mallard specifically, birds tend to be a little skittish around people. Even ducks that are fed by the public regularly, but these ducks are actively taking food from his hands- they know him, this is a regular occurrence.
Equally its funny to me that
Gresley is doing this in a full suit, dress shoes and all
You can see his hat in the background, casually left on the grass,
Also what's presumably the family dog trying to figure out what's going on.