Sure did - invented in Scotland by John Logie Baird, there were in fact about 400 receiving sets in Britain at the start of WW2 in 1939. The invention of radar, by another Scotsman, necessitated the use of televison broadcasting towers, and the braodcasting was switched off for the duration of the Battle of Britain, as indeed the rest of the war. Radar, or as it was known the Radio Direction Finding (RDF) was a crucial element in allowing the Royal Air Force to see Luftwaffe raids building up over France, then heading for Britain.
Germany itself had a version of radar, but nowhere near advanced as British RDF.
Had Germany proceeded directly across the Channel after Dunkirk, television and radar would have fallen into Hitler's hands, probably enabling a German victory.
The Germans didn't know what the towers were for, and by the time they had realised the importance, it was too late.
Thankfully.
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