The original ident was the one they correctly date to 1982.
The second ident was the "less explosive version of the Central ident [...] introduced in 1985".
Was it balls introduced in 1985. It was introduced in 1983 at the latest.
It's a little bit washy with Central, there's a distinct possibility that the original logo did still pop up around 1985, although I'd say it must have been a rare sight by then.
Same with the gradient blur/cake - for years they were used together on screen. I've got recordings of Central's late night (branded "Central Later") showings of UFO c.1986, and at that point all the end-boards were still using the gradient blur, and most (but not all) idents used the cake.