SteveR
When you do differences training what rating or license do you receive from the CAA? Answer: Nothing. That's because differences are not ratings. A rating is SEP or MEP that sort of thing.
Your last post shows that you are a little confused over this issue.
During a checkride, not necessarily, so it's Pu/t or P1
You don't seem very clear over this issue. If you don't believe me at least believe BEagle - he's an examiner!
Cool down a little before even more people are confused.