But that would hurt their scandalous profit margin!
ADSL is, as you know, mostly BT and resold by others. Some ISPs have their own equipment in the local exchanges (LLU), while others have their own cable network (Virgin Media, TAFKA NTL). I don't *think* anyone is running new cable ATM and BT are plodding along at their usual pace. The real problem is that the ASA has allowed all this "up to x speed" bollocks to continue, thereby allowing all UK ISPs to vastly oversubscribe their capacity. Virgin Media seem to be randomly re-purposing broadband capacity for their bloody cable TV, crippling the broadband speeds in the process. I'd go the BT Infinity route but need to do a little research first into how much the local Infinity capacity is used; if it's utterly thrashed, there's no point changing to something equally as unstable.