I do know that folk here are pretty clued up on most stuff from past experience so apologies if everyone already knew this but it could be of interest to some.
I've been hitting close to my 5gig MAAF limit quite a bit recently and been wondering about a shift to Plusnet. Signed up last week and went live yesterday. I didn't pay much attention to the Plusnet prediction of speed on my line of 15-17 meg as it was the monthly limit I was interested in. However looking now I see that all MAAF products are 6 meg ones according to the website and I used to get that. On Plusnet a couple of speed checks yesterday showed me over 11 meg.
So - a quid a month extra has got me double the monthly limit and almost double the speed