Sounds like there are DNS issues with the ISP. Fine for me via Sky broadband, and on my phone (T-Mobile).
Des/Tighty need to have a word with their hosting company and see what they can do (if anything).
APAT's DNS servers look to be pretty much set up correctly:
http://www.intodns.com/apat.comProbably what he said.
We had a problem late last night. Des has been on to the host to get it sorted.
It's working again this morning for me, but might take a short time to filter through to everyone.