"The date on the BT Infinity Site for Yeovil is teh 31st dec 2012"
It will possibly be FTTC (Fibre to the Cabinet) which still give speeds far superior to current broadband speeds. The quoted speeds I have seen is up to 40mbs download speeds for FTTC.
Well I will believe it when it is in and working; it will be a vast improvement on my 3mbs down load if it is a good day.