"... How long did those making the assumptions about the anti irishness of brits, spend living on the UK mainland?"

Claims, Guest. Claims.

I've lived in the 'UK' all my life, and members of my family live in various places closer to the pulsing heart of it than I.
If the Kingdom is United, what difference does it make as to the part of it, I'm in?
Your statement itself is exclusionist...

When one experiences more suspicion than welcome in one's everyday, it has to set a fella thinkin'

(... on the move at the minute...)

I'll be BACK!!!