Thanks for all the replies and info. I was going to let sleeping dogs lie, as the connection went back to normal over the weekend, but today my Freenetname/Madasafish dialup is back to garbage already!
I'm currently wasting £12.50/month for my anytime dialup with these plonkers, any suggestions for a replacement?
One thing that concerns me - I have a .co.uk which I don't want to lose, especially the mail address that goes with it. Would that be a problem to move to a new ISP?