I also think they may have shown an episode as part of a tribute to Lew Grade, and possibly one during a tribute to John Cleese as well but im a bit sketchy on that
It was the John Cleese episode shown as part of a tribute to Lew Grade/ATV on BBC Two on a Saturday night, JD, just to clean up your sketchiness! - I'm pretty sure that was all we've had on terrestrial since '87...
Nickelodeon UK showed seemingly all 120 episodes around 94-95, then again late night in '99-ish, but only Sky customers got the extended hours for most of that time, and I know I was one of those who missed out...
The Disney Channel rarely shows anything older at all, so I'd be majorly surprised if we ever see anything from them...The DC logo'd episodes on Youtube originate from Austrailia, apparently...