Blimey!
I guess this is why the CG66 system exists!
For those that don't know, CG66 is a Coast Guard register to help them/RNLI/Helicopters identify your craft if needed.
You upload your and your boats details to the CG website with picture, then in any event the CG can pull up a pic / identifying features list of your craft.
It is an online or paper registration and easy to keep up-to-date.
https://mcanet.mcga.gov.uk/public/cg66/
Rob