By all means RoYBoy,
bring your 320 experience overhere and join on the A330/340....I am sure the 500 pilots on the A320 list plus the troops on the A300 will not mind you doing that for a bit!
Plus you will be sooooo popular, with all that UK based A320 experience you are willing to share.....Jeeewizz!
My guess is you would have to do some time on the A320 (Max 3 years) before you transfer to ANY other type.
This all being said...if you would have been a 737 driver that just might have worked on the B777. But on the bus....dont think so!