Apologies lads, I've been trying to bring the problems you've experienced to the attention of the sites admin (owner) but haven't received a response to my last mail, I've pm'd him again today.
When I last heard from him in November he said
As the site is available via a mobile connection via 3G etc it shows the site is working so it's possible that there's an issue with his computer's or router's DNS server configurations and a simple restart of both might fix the problem.
Afraid we'll just have to wait for him to return before we can try to sort it further

.