cliver, TBH if i was looking to move away from TalkTalk Business FTTC I would only consider moving to Vodafone, Sky or AAISP FTTC, thats assuming VF or Sky have their backhaul at your FTTC exchange.
Apparently Vodafone (ex C&W) have multiple 10gb/s links to exchanges they have LLU'd so plenty of capacity and almost zero chance of exchange congestion. They now also give out broadband username and password so free to use your own router as their own router isn't the best. Sky FTTC is also highly rated though they have recently stopped offering their 80/20 Pro service, so no more static IP option available (and better support?). AAISP, well they're arguably the best ISP around obviously not cheap but their prices have come down in recent years eg their 1TB FTTC service (TTB based). IMHO going with any 1 of these 3 will pretty much guarantee you a decent FTTC connection.
