SEP Renewal of UK PPL in EASA aircraft
 

Now that I have a self declared medical as I fly non-EASA aircraft does this prevent me from doing my SEP renewal in an EASA aircraft?

Presumably you have a UK CAA licence as you are flying with a declaration and can also fly EASA aircraft until 8th April 2018 unless sense prevails and this will become the norm.

PA28181 it is indeed a UK CAA Licence, thanks for the clarification.

If you're referring to the flight with an instructor, do you need any licence or medical to fly with an instructor?

The OP isn't referring to an hour with an instructor as he has stated it's a renewal, which - of course - can only be with an Examiner.

Do any examiners NOT have Instructor qualifications?

LowNSlow - The answer to your question is: No, it doesn't provided that the renewal is completed before 8 April 2018.

I don't think Ground Examiners are required to hold a flight instructor rating and they can once again sign licences.

TOO

If the flight must be with an examiner, it cannot be a ground examiner.

True. If it is a renewal or revalidation via Proficiency Check then the Flight Examiner would not be acting in an instruction role, so while holding FE requires a current FI, the roles are separate. This is a reasonably frequent issue when flying private/group aircraft, where the insurance may cover us while giving instruction to named pilots, but that is a different role to examining them. Many minefields!

Thank you all for your clarifications. :)

Presumably the UK PPL revalidation in an EASA aircraft, for a "self-declaration" pilot will be in a rented aircraft, not a Permit aircraft, so likely to have insurance cover for the examiner, of the FBO use him.