Which building society are offering best remortgage deal?

Answers:

that depends on your circumstances - what does "best" mean to you?
speak to a decent broker (yes, thats me - but any qualified independent broker should provide you a wide choice, check if they really have access to the integral market or a whole of bazaar panel)
ask how much they charge as well!

goggle the question and im sure you will fine a network site that will display the mortgage deals/rates