There is a further option - keep your PPL, comply with the revalidation requirements for an NPPL and fly with an NPPL Medical Declaration from your GP until your PPL expires. NPPL restrictions will apply (no night, no IMC, no flight abroad etc) so it depends upon the type of flying you do. Before your 'PPL' expires you apply for an NPPL and carry on flying with that.
znnw5, you are probably referring to the ORS4 No.711 exemption for non-NPPL holders who either cannot or choose not to hold JAA Class 2 medical certificates.
To take advantage of this system, either your SEP Class Rating must be revalidated
just as it would under JAR-FCL or, if you wish to revalidate in accordance with SSEA revalidation requirements, you must apply to the CAA to have a SSEA Class Rating included in your non-NPPL.
You can't have it both ways! Whoever gave you that notion?