There is no thing as a P1 seat.
The PIC can sit in either front seat in a spamcan.
To fly in Class A airspace (UK Airways) you need an IR. No IR means no Class A flights.
To fly in Class A without an IR is illegal although there is no 'passport control' on entry.
So in short:
Q: Can you do it; A: yes you can.
Q: Is it legal; A: well yes as long as the chap in the LHS doesn't log it; after all he is not more or less controlled than 'George'
The Law and Regs on neither side of the pond will give in words of one syllable chapter and verse on every evantuality and situation that we can think up.
What matters is, if you drill the thing into something that shows, will you still looks squeaky?
