Had a quick search but just came back with a load of slamming stories.
Shouldn't matter too much about the hardware. Switch on, add SSID, tick WPA/WPA2 and type in a decent password. Don't most ISP routers come pre-configured now though, or is that what their £10 charge is for?
Might be worth pointing out this term to your 'helpee' that they have:
Q: How does my renewable contract work?
At the end of the initial minimum contract period for your package, unless you tell us you do not wish to continue, your contract for your package will be automatically renewed for a further 12 months ensuring you continue to benefit from great savings, as the cost of your calls is guaranteed never to increase.