...rumours from within Thomsonfly are for the B737-800 and -900 to replace all B737 and some B757. The B787 is favoured to replace B767-200 and -300, and remaining B757.
A two type fleet has been mentioned as the most efficient and economical option...
This isn't just for Thomsonfly UK, it's for the entire TUI fleet - so expect a large order with substantial savings on list prices