Hi Everyone
Thanks for all your replies
I had an someone come and look at it today and put a new LNB on which still didn't work properly...he charged us £20 & they were here for ages too... its working slightly better but still breaking up, in the end after much testing etc it was our sky box that was faulty and it turns out the dish wasnt much better either. So we decided to upgrade to Sky plus. We bought a dish and box off Accy market today and the guy is coming to fit it all tomorow.
Thanks again