Nevertheless, all appears well in the land of USBUIRT - it is receiving 100% and transmitting as, I believe, it should although I'm still having lots of fun getting the codes right and ensuring the IR is delivered etc etc. As suggested by Thom, I'll probably invest in a dual-head emitter to target my devices more accurately for a start and, do my level best to get discrete codes. Toggle is a nightmare!! My TV goes on and off all the time to the degree that I've taken the power code out of the template and I'm controlling it manually at this stage!
Great to hear that its working!