When did you last switch your bank account?

When did you last switch your bank account?

Competition's fierce in the current account switching market right now, with some banks offering £100+ in cash or vouchers to switchers. So whether you want better service, interest on your savings or just free cash – changing your day-to-day bank account can be well worth doing (see Best bank accounts). But when did you last do it? And if it's been a while, why?