So does anybody know for sure whether the PPL examiner would have to have a C510 rating in order to do the flight test?
That is very easy to answer. An Examiner must be qualified to act as PIC of the aircraft he is examining on, and hold a valid rating to instruct on that Class/Type.
I understand what this chap is trying to do but even if he did obtain a PPL on such an aircraft he will still have to do an additional Class rating skill test to add the SEP rating, so why not start by doing the SEP and then perhaps transfer the Mustang rating to it.
To get a JAA PPL as the holder of an ICAO licence issued by a JAA member State, all he needs to do is:
A pilot licence issued by a JAA Member State in accordance with the national requirements of that State may be replaced by a JAR–FCL licence subject, where applicable, to conditions. For the replacement of such licences the holder shall:
(b)
(ii) for PPL(A) only demonstrate to the satisfaction of the Authority that a knowledge of the relevant parts of JAA Requirements (see AMC FCL 1.125) has been acquired;
(c) demonstrate a knowledge of English in accordance with JAR–FCL 1.200 if IR privileges are held;
Whilst AMC FCL 1.125 lists the entire PPL theory syllabus, an ICAO licence holder with the required experience from a non JAA State is only required to pass Air Law and HPL. He will then need to pass a Class rating Skill Test in a SEP aeroplane.
As all Type rating courses since 2000 have been in accordance with JAR-FCL it should not be difficult to transfer the C510 rating to this JAA PPL
He will also be required to obtain a UK FRTOL which might prove more difficult than getting the PPL