Hi Chris (and list)
I've just been doing a bit more testing with my recently acquired Nanostick 290e...
I added a fake channel with the frequency 618000000 MHz (my HD mux), QAM256, and everything else set to auto or random values. I then switched to it. vdr then picked up BBC HD, ITV1 HD, Channel4 HD, and BBC One HD.
Hmmm, interesting, Qam256 is used in the US for Unencrypted cable. Does anyone know if a ClearQam US tuner would work with VDR if you pointed it at a Freeview UK HD Mux? Will have to bring one when I next visit my sister in London. However, if it did, the plethora of cheap ClearQam tuners would help get VDR users HD Freeview..