If you have done the necessary 100 hours instruction TOWARDS THE INITIAL GRANT OF A LICENCE (note) in 3 years of which 30 in the last 12 months you will only need to do the test.
I should expect to have to give a pre-flight brief on one of the exercises from the PPL syllabus and maybe have a discussion about some of the other issues, such as Privileges of the PPL or something.
Then out to the aircraft to fly the exercise, with the addition (in my recent case) of a patter and demonstration of spin recovery from a developed spin, a demonstration and patter of a 180 degree turn on instruments, and a demonstration of a PFL. Back to the circuit for glide, flapless and short field approach. Mine took 0.9 from brakes off to brakes on.
Sound OK?
If you haven't got the necessary hours you will need to do the 2-day seminar. I did it and skipped on the pre-flight brief and theory chats because we just discussed what had been taught on the seminar.