As the others re xilo/uno, which is undoubtedly a good ISP. Similarly vivaciti.
PlusNet has been mentioned, and clearly, seeing as I'm with them and happily extended my minimum term by 11 months in January, when there was reason to other than making sure I was on the best possible terms in case I stay for several years and increase my usage dramatically, I recommend them.
With O2 you are on ADSL2+
. Wherever you go there will be no change to that - just whose kit your line connects to at the exchange, the background line control systems, and the ISP backhaul and capacity).
My broadband basic info/help site - www.robertos.me.uk
| Domains,website and mail hosting - Tsohost
Connection - Plusnet
UnLim Fibre (FTTC). Sync ~ 55.8/14.5Mbps @ 600m. - BQM
"Where talent is a dwarf, self-esteem is a giant."
- Jean-Antoine Petit-Senn.
Allergy information: This post was manufactured in an environment where nuts are present. It may include traces of understatement, litotes and humour.