Oops ~ try again.
I've just retired after 30 years of nothing but heavy jets and am currently revalidating my PPL on SEPs. Great fun and luckily a bit easier than it was. They relaxed the rules back in May ~ see General Info Doc No. 33, Version 7 ~ specifically Part 3 (Aeroplane Ratings expired by 5 years or more, Single-Pilot, Single-Engine Class Rating.....(a) and (b). Also, back a paragraph or two,"No mandatory additional training will be required. Applicants should complete training at their own discretion sufficient to pass the Skill Test" and the Skill Test is as BlueLine describes. This is all straight from the horse's mouth from the guys at Gatwick SRG.
What I would say is invest in more hours than you would think. You never lose your basic flying skills and it comes back no problem, but the environment is definitely very strange and takes a while to get back into. Have fun!