I've occasionally looked at publisher Celebrity / Clearmark comics in the past...
Count Duckula is here
The wisdom of gnomes is here
Wanted is here
Cookie here
Henry's cat here
Summer specials here
Ovide here
And there may be other titles out there just waiting to be discovered. One such title that was new to me was their Rupert comic from 1989/90. There are a LOT of Rupert comics out there so I'm currently parking this in the 'too difficult' to deal with category. I'll return to it at some point I'm sure. In the meantime if you can help with any details do just get in touch.
I recently spotted an auction lot on eBay for these comics - so I've clipped a few images from the listing for my covers gallery below.
UPDATE: covers for issues 16 & 17 now added - the covers gallery is now complete!
FURTHER UPDATE: I've now added cover for the summer special
UPDATE: We now know that the title lasted 20 issues. All new images highlighted in red. Interestingly issue 10 has the publisher recorded as Celebrity but by issue 12 the publisher has been amended to Clearmark.
Celebrity comic, Rupert, issue 1, 18th October 1989, 50p
Celebrity comic, Rupert, issue 2, 1st November 1989, 50p
Celebrity comic, Rupert, issue 3, 15th November 1989, 50p
Celebrity comic, Rupert, issue 4, 29th November 1989, 50p
Celebrity comic, Rupert, issue 6, 27th December 1989, 50p
Celebrity comic, Rupert, issue 7, 10th January 1990, 50p
Celebrity comic, Rupert, issue 9, 7th February 1990, 50p
Celebrity comic, Rupert, issue 10, 21st February 1990, 50p
Clearmark comic, Rupert, issue 11, 7th March 1990, 50p
Clearmark comic, Rupert, issue 12, 21st March 1990, 50p
Clearmark comic, Rupert, issue 14, 18th April 1990, 80p
Clearmark comic, Rupert monthly, issue 15, May 1990, 80p
Clearmark comic, Rupert monthly, issue 16, June 1990, 80p
Clearmark comic, Rupert monthly, issue 17, July 1990, 80p