The rental firm I worked for in the 1960s had a few 405 line only 21" Pyes, model simply labeled V700, sent to our branch. As I remember, we never received any service information for these sets, but within a few months we had the first batch of the model V700D, which proved to be superb performers on 405, but after fitting a UHF tuner to one, did not look so rosy on the test signal that we got from the temporary Pye mobile demo test transmitter set up near Derby. Bridging two (HT) tags on the uhf connection tagstrip enabled the VHF tuner on UHF. Some interesting continental signals were thus received - early DX TV.
Tony.