Thanks for the info. I have an Engineer from my Housing Association coming out Friday afternoon to have a look. I will get him to test it. What's the purpose of Bellwire? My house is only about 18 months old, surely they can't have put that in knowing there's a fault it causes, can they?
Well my BB speed is now 7.41mb at exchange and 6.64MB to me so it's a lot better.