UK PPL Revalidation

[chickencanfly]

Hello all
I need to revalidate my UK EASA PPL while in the USA for the first time. I understand the requirements for Revalidation, hence I am getting 1 hour training besides all the other requirements, but not sure if I have to fill a form/application and email or mail to UK CAA. If not, how does the UK CAA know that i have a revalidated PPL?

I will need to verify my license after revalidation with UK CAA an d FAA.

Thanks.
Chickencanfly