This may well be on folks' radar already, but YouTube user Sticky Tape 'n' Rust has been uploading loads of late 80s - early 2000s junctions and CBBC continuity. A lot of them seem fairly unremarkable ephemera but there may well be some gems there.
Not a gem exactly but 17th Oct 1993 and Ratz is already on CBBC, they didn't waste any time did they (given he made his Live and Kicking debut 15 days earlier). Cleary commissioned with the intention of making him an Edd the Duck replacement on CBBC, though I think the only time he made it into the broom cupboard was during school holidays.
To be fair, I wouldn't even want to guess at how much the tech for a live CGI puppet would of costed the BBC at the time. It must of been a significant investment vs whatever Edd the Duck or Gordon The Gopher had ever cost the corporation in R&D.
I see the idea behind it though. The previous CBBC "sidekicks" had been reasonably popular in their own right. Edd did well enough to get a milkshake line as well as a video game. So the BBC wanted a sidekick that suited the 90's and would have similar licensing opportunities. CGI was very cutting edge in 1993 and just starting to get into mainstream media at that point, so a CGI puppet would totally appeal to the kids better than some old-hat real puppet...right?
I assume the tech was similar to the Silicon Graphics set up Nintendo used at a 1992 trade show
Which likely was a hoot at a trade show, but debatable if it really worked as a co-presenter on TV. Some sites claim Ratz had a habit of breaking down, but I've not seen any unearthed clips showing that actually happening? The main issue is that Ratz can't really mess about or create antics in the studio like Edd or Gordon, or really interact outside talking with a co-presenter or responding to viewer calls and letters. Phillipa seems to be the only presenter who would get rota'd with Ratz too, I don't know if that's intentional - or everyone else just didn't like presenting with a disembodied cat head they might not always be able to see.
It was one of those ideas that might of seemed like a winner at the time. But then they went back a few steps for Otis - who really became almost a proper presenter as much as a puppet sidekick for the presenting team.