I hope this won't be classed as advertising (I have no personal interest in the company) but if so then I don't mind the post being removed.
A few years ago my wife heard of a company called Utility Warehouse, thoroughly researched them, changed us over to them for gas, electric, phone and broadband and became a freelance salesperson for them (no longer though).
Have a look into them. I can thoroughly recommend them, contact is easy to get to a 'voice', they are extremely helpful and very efficient - in our experience anyway.