Having looked into it a bit more, it's most likely that the set I owned was a Philips 570, which was indeed based on a later version of the Pye CT200.
Seems these sets aren't much loved by the industry, though as I say my particular set gave the Thorn Ferguson we had a sound thrashing in reliability terms. Wouldn't mind working out what that was actually -- 1976 (maybe 1977), 22", fake wood surround with mostly black plastic front, four vertical sliders (volume/brightness/contrast/colour), round silver on/off button, six small, round silver channel selectors in a horizontal row just numbered 1 through 6 (the 1 and 3 buttons had lost their latches so sprung out of the TV when changing channels), channel tuner pots around the back. Very washed out picture even with a brand-new tube, and the tubes themselves (Mazda-manufactured I believe) didn't last more than four years each.