SD, since the original poster (Roach) said it affects 4 machines (3 laptops and a desktop) I doubt it's a host file issue.
Hence my suggestion of a DNS issue, NTL regular fails to resolve google and ebay although other sites resolve correctly.
Roach try editing the DNS settings on your router and defining 193.155.207.61
as a DNS server, then reboot the router and the affected machines.