First Direct consistently offer £100 for those who switch their current account to them and meet their 'primary account requirements'.
About once or twice a year, it increases to £125 - which I've been waiting for.
This increase has just happened. This is the first time it's been this high since the funding requirement was dropped from £1500 per month to £1000 per month.
The £225 if you switch and leave is related to the extra £100 you get if you are unhappy with the bank and leave - from what I've been reading online, most people stay.