Did any answers to this come up as I have a similar problem with 2 sites I have hosted.
I also cannot see lathes.co.uk which is on the same server as my 2 ( 213.171.218.?)
My isp is BT as well but they are as good as the hosting site. Some days I can get the sites OK but most times zilch.

If it dosent improve I will look for a more reliable hosting site.

peter