When is the end of university term in the UK?

I am a Canadian going to study in the UK in September and as it is a pricey endeavor I need all the time I can get in the summers in between school to go back home and work. I was wondering when school finished in the UK as it is normally finished in Canada in mid-April-early May whereas I thought I saw something talking about examination periods being in the middle of May at the university I am planning to attend.