Is it just me or is canon.co.uk down on BT. It is up here in the North East of Scotland. Don't even get the DNS entry for it.
I can browse it using proxies so the website is fine, I always fine website where BT have either had a links problem or DNS problems. Never had this on any other ISP.
Possibly a problem with Canon's DNS - the parent servers for their DNS servers aren't giving out the A record i.e. the IP address that goes with the NS record.
Their DNS servers also appear to be open and therefore liable to DNS poisoning.