What i'd say, if you're looking for UK providers - post on the TechKings forum and request a trial, i've found alot of good services on there that don't advertise anywhere else (you wont ever see them on reddit) and it is a UK based forum.

I'm in Europe with a 300mb connection no buffer issues on Vader.

Anova is the best UK-focussed service I've used. Very stable UK HD streams - has the main US channels and NFK/NHL/NBA/3pms etc as well. It's reseller-only. The reseller I use isn't on reddit but I think there is someone on here who sells it

Have a UK and USA focused on that might suit. Please for a trial

I can provide a trial, we include UK/CA and US with 5 connections PM me if interested

Pm me if you want to give Limitless a try. I'm running a Cyber Monday deal for $20 usd for 3 months.