Hi can anyone help - newbie here!

I have a Telewest Pace box and am having trouble getting the Archos AV500 to recognise it via the IR emitter and change the channels for me - thought this may be due to PACE/Telewest using a different IR protocol, but have also have tried it on a Alba STBX3 Freeview box, still no luck. Has anyone been able to connect either of these boxes?

The AV500 works fine through the VCR and recognises that and changes the channels, but as it doen't recognise AV as a recording channel (where the digi box goes into the tv) can not get it to record digital as it won't change the channel on the VCR to AV.

Any help would be appreciated.