On Sky analogue, it was until 30 June 2001.
Until when did the UK have a CN / TCM timeshared channel?
The pan-European TCM got 1 hour back on April 1st, 2003 and they used that extra hour to air documentaries about American cinema.
Yes, Sky switched off its analogue services on 30th June 2001 marking the official end, however at that point in time CN/TNT/TCM was never a part of a Sky package, it's just a vast majority of satellite TV viewers were Sky subscribers, which is where the association comes from. Turner switched off the analogue transmission slightly earlier than everyone else at 12am on 30th June, meanwhile all the other channels continue to air on analogue satellite's final day.
On analogue cable, it continued for years (just as a converted version of the digital feed, alternating between CN and TCM) as each area was switched off individually, the last areas were Milton Keynes and Westminster (Central London, ironically where CN's offices were) they couldn't be upgraded to digital as BT who owned the cables refused them so they were simply turned off at the turn of the last decade, elsewhere people were encouraged to switch over to digital cable. However, I'm not entirely sure how long CN/TCM lasted on analogue cable.
German broadcasters were queuing up for transponder slots on Astra 1 and the UK was transitioning to its own digital satellite grouping - Astra 2.
Promo for the end of Cartoon Network on analogue satellite:
The end of Cartoon Network/TCM on Analogue Satellite:
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