Alas, I'm a stranger to which ISP offers the EU the best technical availability, as we have certain numbers to ring and more-often-than-not, have to quote a job specific fault reference number to verify we are indeed an OR engineer.
I do however have a picture built up in my mind of who's who, gauged from the level of abuse I get when visiting the EU's premises. Again, IMHO SKY appear to be easy to deal with. I would say (again IMHO), TT are the worst.
*PS - I put Opt 4 in a previous post above ..... it's actually Opt 5*.