The answer is yes, and no!
I had no problem tuning my LCD TV into the Spectrum’s UHF signal (my TV has an old analogue tuner as well as DVB-T)…
Unfortunately some of the keys do not work, specifically q, w, e and b, n, m and symbol shift.
A quick look under the hood again, and indeed I can see that at least one of the strips in the right ribbon cable has a break in it. New keyboard membranes seem to be about £10, so I may try and fix it or even see if I can pick up another Speccy for less.
All good fun!