Sounds all too familiar. I too was summarily sacked for doing precicely what our (immediately Ex RAF Gp. Capt. with no civvy experience.) had instructed us to do in the event of a shortfall in legal paperwork - Sacked if you did. Sacked if you didn't. Sacking occurred one on one in a pub garden - so it was totally unattributable to the company. That man was an utter disgrace to his uniform(s).
BALPA, of course, were as useful as a chocolate teapot.
There are some utter sh!ts in this industry, far too many of them but in the event might is right.
If the little guy comes up against the might of the Company then he's toast, even in "law abiding" UK. Best get that idea straight, justice is rare in such cases.
At the end of the day it proved an excellent move as I left one incompetently run cowboy outfit and joined another far worse...but got a useful type-rating out of it that proved its worth on the next move.
It's a jungle out there!