I would guess that the only consistently high data rates in the UK will be either via Business ADSL products or cable.
The former due to the lower contention and the latter because of both a more robust infrastructure - no comparable problem to the distance from exchange with ADSL - and lower contention in most areas.
This is a general observation, not a recommendation, however - particularly as (unfortunately), there is only one cable supplier in the UK, and the customer service is poor.
SD