Hi all can anyone help me with a couple of questions i have?

Does any one know the breed number for a lilac cream british shorthair?
Also does that class as a solid colour?

I have a lilac cream kitten from a solid to colourpoint mating.
I know that to show her she would have to be put on the suplementery register non active, in the future iam planning to breed from her, could i at a later date register her active?

Sorry for all the questions
thanks jenny