You don't send anything from your licence to the CAA!
In the final 3 months of your rating validity period, a UK/FE(PPL) will need to sign off the Ratings - Certificate of Revalidation page in your licence once you have met the 'second 12 month period' revalidation requirements. You will need to produce your logbook, to include a signed entry by the FI who conducted your 1 hr training flight. Then complete the relevant form, have it signed by the Examiner when you produce your logbook and licence and send the form to the CAA.
The Examiner should not charge you for this, neither is there any payment due to the CAA.