[Margaret Pilkington]

I had a problem similar to your .......but a long time ago. I contacted them and they sent me the ADSL filters........and stupidly, I put them onto the connection next to the computer(Where you plug the line in for the internet connection)...........when I put the filters on the junction box (where you plug your phone in), the problem was cured.
Had a similar problem when we upgraded to Sky+........that line needed a filter too, but no-one told me. I figured it out for myself.

While I am not saying that this is your problem, it worked for me.

Hope you get sorted soon Kate.......it is a blooming imbuggerence when services don't run as they should...especially as they aren't cheap.