I have been using a HH2 for a while with Plusnet and as a basic router it is fine. The wifi however with a HTC Wildfire has always been a bit iffy and the power consumption of the wifi was quite a high percentage of the phone's total.
Checked on the web and apparently there are a few problems with HH, wifi, and Android. Did a few of the checks and a full reset and nothing particuar changed.
Dug out an old Thomson router and the situation is transformed. Rock solid wifi and much lower phone battery consumption.
Just thought I would mention this in case anyone else is having the same problem.