To those thinking of jumping ship to fttc providor be aware that you need a visit by an open reach installer to get it going and there 'managed install' people are useless / pressured into doing as many jobs as they can a day successful or otherwise.
I have now had 4 "engineers" visit in the last two weeks and still don't have a working connection!
Btw the £38 cashback isn't that great of a deal, as I got more months half price (9 I think) when I went to them direct