i've got a danfoss TP5ERF it's great! it's radio controlled so you have the main programmable unit to enter times and temps u want and the reciever controller which is located next to the boiler the great thing about it is there are no wires so u can move it any where u want in the house five star m8!
p.s. pretty sure u can get the whole thing from screwfix now oh yeah and its a doddle to diy for an old one!