If you talk to the CAA about licence re-issue (there is no such thing as licence 'revalidation'), they will ask you why you haven't read LASORS. And will tell you to speak to an examiner.
Sorry if you cannot accept it, but I am correct in what I say.
The payment is for licence re-issue, not for the SEP Class Rating variance. The pilot's rating is less than 5 years from the last expiry date.
Again, the guidance in my post #7 is all that is required - and I don't need to cut and paste half of LASORS 2007 to back it up.