Thanks for that, Think I'll give have to give
IBB a go - got home from work at 5.30am this morning (on nights this week) and decided to play a little xbox before hitting the sack. Couldn't do it - apparently my 'broadband' was 8 (eight!) kbps, though to be fair to Clearwire it did shoot up to 90 kbps a few minutes later...
I did get 2mbs a few times during the week after I complained, so I can't really believe this 'signal noise' stuff. And my reciever is by a window, I'm not in a built up area or living in a forest.....
Think I'll call it a day with Clearwire.