I've got a 1:144 F-14 I plan to finish in the next week, and I've just started a 1:144 Harrier, so updates might be slow.
My current plan is to base the external color scheme on the Queens Flight Wessex with the colors, insignia, and flag changed.
I'm currently still iterating through ideas for a replacement for the RAF roundel.
When I get to it I'll probably add a few out of use Old English letters [like Thorn] to the registration number.
I hope to finish with drawing a mock-up drawing by next weekend. When I've got it done I'll post it here.
Thanks again for the help!