Milo and Mixture, thank you. Point well made re. security so I'd better stir my stumps and wade into the murky waters - yet again. At least now there is a slight hope of getting back to (insecure) dry land!
Milo - router is an ISP provided Thomson. ISP is Plusnet and I'm using them after previously AOL, BT, Orange, Tiscali and TalkTalk - all of which were, or became, rubbish!
Main computer is an HP Pavilion running XP with 4Gb and ethernet wired for internet. SWMBO's machine is a Compaq small desktop, 1.5Gb XP Pro also hard wired. The machines for Wifi are a Dell Expiron 2 Gb on XP Pro (dual boot Suse Linux) and an Advent 96Mb!!!! on XP Pro plus the two new LG Nexus 4s - an 8Gb and a 16Gb.
Before I venture into the security underworld, I have tried the Nexus and it works fine in the main bedroom which is about as far as I need in this house.
Back to the fray and I'll let you know what happens - if I don't just throw the whole lot into the North Sea!!