First package I had was via BTW 20CN, Office 40GB, soon upgraded to Office 80GB, off-peak (8pm-8am) allowance is 200GB.

Second package which I am currently on is via TalkTalk's LLU (no other LLU at exchange) but uses Xilo's backhaul, TalkSurf Pro 50GB, no off-peak, only £27 which includes line rental, further usage is £0.66 per GB. Bit irritating that their aren't more packages available (ie: with more usage) but TalkTalk's highest package (with line rental ~£25) only offers 100GB with poor speeds so this could explain it I guess (not Xilo's fault).

Support when needed has been very quick via the ticket system on their website.

Speed follows IP Profile, as it's LLU I can push my router to achieve higher speeds. Have a copper line @ 4km from exchange.

1st package: 2.5-3.5Mbps / 0.7Mbps.
2nd package: 4.5-5.5Mbps / 0.8Mbps.

Value, first package was quite expensive at ~£38 not inc. line rental for what you get, this is BTW's fault as they charge not only for the connection but usage used as well. Second package, ~£10 cheaper and includes line rental, perfect.