No - see
NPPL - General Introduction to the NPPL medical requirements | Medical | Safety Regulation
If your quack has doubts, tell him/her to contact the CAA Chief Medical Officer. Or, if you are an AOPA / LAA member, he/she may contact the relevant organisation's medical advisor.
If you do not have the relevant 'NPPL' medical form, you may not fly as PIC.
Remember that you cannot apply for a JAR-FCL licence re-issue if you do not hold a JAA Medical Certificate.
If you wish to fly under the exemptions of ORS4 No.756, you must
either:
Maintain your SEP Class Rating under JAR-FCL rules (except, obviously, for the medical).
Or:
Apply to the CAA
not NPLG for an SSEA Class Rating which you will then need to maintain under National rules. There will an issue fee for the SSEA Class Rating as it is your
choice rather than an obligation.