Well the Pronto arrived and 10 minutes later got it controlling the Sky box. So it can learn the codes and rebroadcast ok. Only issue I have is I need a serial connector cable and a serial port to get the data out. Got the soldering iron out and made one up but having issues connecting via my USB/COM port connector. Got some old PC's around which should have a serial port so will try and fire one of them up, not used in over 10 years so no guarantee.

Making progress though.