Recommend me an energy supplier

At the moment we are supplied by British Gas for both our electric & gas. They’ve just sent me a letter for an alleged debt from 2006, which we resolved with them about a year ago when they chased us for the first time.

When we moved into our current property we were chased for a debt from Npower from the previous tenant, who they realised had moved out but until they found them they decided to keep sending us the letters – just in case.

So apart from British Gas & Npower who’d you recommend?!