[Spencer]

The first version was probably made by the design company probably why the central cake isn’t as well rendered, the grey part isn’t right, the other two was the proper central cake.

I think you’re right. The flatter looking cake logo from the first version of the endcap also appears at the start of the Central version of the ITV 1989 generic ident.

youtu.be 

I would imagine it was part of the 1989 presentation package provided by English Markell Pockett.