Bookish Reader

I know you must be thinking Sherrinford is Eurus which was the therapist but she never specifically said she has Sherrinford. Based on what we have seen with Mycrofts notes to call “SHERRINFORD” maybe it’s not a person but a place? maybe where Eurus was being kept? or Moriarty? 

Let me bring your attention back to this:

There was also a shot of a helicopter flying over a beach which has yet to be shown leaving it to ‘The Final Problem’ aka the season final.

Is this beach ‘SHERRINFORD’!? Is it a top secret facility which houses the truly criminally insane like Moriarty and Eurus? Looking at the men in the picture it kinda looks like a business deal more than a prisoner hand over.