Thanks for your interest business_kid. I seem to have sorted this out, I'd originally set up wireless networking manually, thinking I'd need only to connect to the one router at home. I installed Network Manager later when I took the laptop away with me. I realised there was some sort of conflict between Network Manager and the original set up, so I deleted the ifconfig file, which gave me local networking only, but nothing else despite entering valid DNS addresses in the Network Manager settings for the wireless device. I found some info online, suggesting the nameservers still needed to be entered in resolv.conf, and this finally did the trick.
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