Preppy - having studied the Smiths Aircraft Industries' drawing of the prototype Trident flight deck, it clearly shows both azimuth and pitch PVDs (even labelling them as such). Yet, as you have kindly confirmed, pictures of BEA Trident 1,2 and 3 flight decks show only azimuth PVDs. It would be interesting to know why the pitch directors were never fitted to operational BEA aircraft....
Don't know about the Belfast, sorry.
Back to the Trident, what was the cruising speed? I've heard many tales about it being a very quick a/c when compared to current A320/B737 equipment.
Aviation was soooo much more interesting back then!