I have a router from previous ISP, is it worth setting that up, is it easy to set it up (need specific BT info to input?) to work with BT Infinity, or do only certain routers work? It's Huawei HG633 model.
Won't work, its an ADSL modem/router and probably locked to TalkTalk in any case. I doubt your problem is the router, more likely to be a line fault.