I think both Waltons and 90210 were not actually Undun shows. Waltons is only there as a Christmas special and it's 1pm timeslot was after Undun usually ended even on weekends, while 90210's slot was an evening one, after The Simpsons.
I recall a big part of "sky wun un dun" was a home grown British comedy, maybe continuity as I recall the child characters being used in trailers, set in a haunted house with vampires.... can't find any information about it though. All undun programmes had a button in the printed Sky Guide next to them.
You may be confused. That sounds more like the Fox Kids pre-launch trailer loop (which would've been on Sky 2's frequency during its downtime between September 2nd and October 18th), as one of the shows it would've advertised was American series Big Bad Beetleborgs, about three kids that visit a house where various monsters live. They had a vampire, a werewolf, a mummy, and a phantom who looked a bit like Elvis Presley, who granted the kids a wish - to become the superheroes of the show's title. A wish that also accidentally created villains for them to fight. The house monsters were the show's comic relief.
No EPG on analogue of course. The listings probably stopped when Sky Digital started.
There was a Sky Digital printed publication called Sky Magazine/Sky Mag from 2007-2011. I can't remember when the old mag for analogue subscribers ceased.
Pretty sure the analogue magazine began to be phased out around the turn of the century, as the entire TV service went fully digital in 2001 from 28.2° East and there wouldn't have been a lot of point in the analogue magazine after that point.
RetroRerun presents a 'nice touch' advert from the Westcountry Television switch over from TSW. I don't like the unaligned text though. pic.twitter.com/8VyxUqez9v