Use nslookup click here to try resolving this google.co.uk and other domain names, see whether DNS servers work well. If having problem, try to configure following free DNS servers provided by OpenDNS click here on computer and test again:
finally working better, i went into router, found bt's dns server addresses and went into another menu which had a dns submenu which just had zero's for the addresses. i entered bt's and now it's running fine.
must be a router problem.
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