So I have this mate that used the Current Account Switching Service (CASS) to switch accounts 7 times in one year and make £800 from bank signup incentives. With many banks offering at least £100 this could be a good way to make money. Quite a bit of effort though, so maybe only worth it if you're a low income earner with lots of time on you hands.
Wow! A friend, you say?
Yeah, obnoxious Indian colleague, as it happens. Not a fictional person if that is what you are getting at. He actually ended up using Starling full time, not even a 'proper' bank. :P