Back in 2002 the Lennox Lewis v Mike Tyson fight got a showing on BBC 1 (as a build up to England v Denmark in the World Cup) a week after it had been live on Sky Sports Box Office. A BBC showing of a PPV fight - that featured a British fighter - a week or so later happened a few times in the years that followed, but hasn’t for some time now. Even more unusually the BBC - somehow - ended up showing a Lennox Lewis fight live (in the middle of the night, not showing the undercard) in 2001, that was when they’d lost ‘Match of the Day’ and were buying anything they could get.
That was really big news at the time, that Lennox Lewis fight - it was a big symbolic purchase to say the Beeb were still major players in sport, and got on the cover of the Radio Times and everything. Though as you say, it was at 4am and they couldn't show anything from the undercard, though they did also do a rerun at 7pm.
That Lewis Tyson rerun in 2002 was interesting, it was completely unbilled in the Radio Times and it was announced a few days before as a "Lennox Lewis Special", and I remember Gary Lineker promoting it during the World Cup coverage and promising "a surprise". The "surprise" being a full rerun of the fight, which presumably they weren't allowed to promote any earlier.
DE88 and UKnews gave kudos