Just to add to it, for the moment you can go on to a NPPL medical and fly under NPPL privs until your CPL expires.
Or your SEP Class Rating is due for revalidation, whichever comes first! If you wish to go down this route ('ORS4 No816'), you will need to apply for an SSEA Class Rating to be included in your licence if you wish to fly after your SEP Class Rating is due for revalidation (assuming your CPL is still valid) - and don't forget the fee!