DH fan :-
Surely Alexandra Palace - Ally Pally - for reception in Southgate, not Crystal Palace?
Of course you are right, and I stand corrected. Indeed, it was the only transmitter until replaced by Crystal Palace in the 50's, though it resumed transmissions later as a UHF relay:-
https://en.wikipedia.org/wiki/Alexan...vision_station
Oh, and there's a WWII aviation connection also, as it was used to bend the Luftwaffe's Y-Gerat beams during the Blitz. The puny UHF dipoles seen now are a sad reflection of the impressive wire antennae that festooned it in those days, and as featured on the nightly Newsreel as I mentioned above.
It was the "People's Palace" and it is good that it has been restored and still sports its original mast atop one of the towers:-
BBC - The Birth of TV - Ally Pally - History of the BBC