Here's something that I found out today, and which might be helpful in this context.
If you do anything that causes your licence to be re-issued as an EASA licence (such as applying for an IMC/IR(R) rating) the CAA wants to have a copy of your licence/rating revalidation page.
That copy needs to be certified by an examiner - although in the letter the CAA did not specify whether that examiner can be any EASA FE, or has to be a UK EASA FE, or actually has to be the FE that signed the revalidation page.
The exact wording in the rejection letter I got is as follows:
In addition to the above [which deals with the SRG1104 form] we require a copy of your page (to show your current ratings) which must be certified as a true copy by your examiner.
So you can probably save yourself some grief in the future by making a copy of the validation page straight after the FE has signed it, and then ask the FE to certify the copy.