To say it's a skills test is 'biggin it up' a tad. It is a ride with an examiner who has the right to ask you to do whatever they feel is necessary. I'm sure there will be someone along in a moment to give you chapter and verse on what should / shouldn't be included.
For revalidation, you must fly 12 hours, 6 of which must be P1 and 1 "Hour With" an instructor in the last 12 months of the two year period. (JAA PPL)
DD