Can of worms + tin opener + stand back, wait for Geordies/Mancs/Yorkies/Taffs/Paddys/Jocks to rip your head off!
Let them.....this is a safety issue, plain and simple, not a prejudice slant or equal oppurtunities thread. I know a lot of
Geordies/Mancs/Yorkies/Taffs/Paddys/Jocks
who work in atc, the simple fact is they don't have strong hard-to-understand accents.