You need to take a SEP Skill Test, but it is not the full PPL Skill Test as stated above. It is exactly the same as the Proficiency Check used for revalidation, comprising of a departure, climb to height, two stalls, two steep turns, a PFL, three circuits to include EFATO and a go around. Takes about 55 minutes.
Cs of T and Cs of E have gone and are replaced by a certificate of Renewal or Revalidation. If you haven't had a current Group A or SEP in 5 years, it goes to Gatwick for signing.
Training as required to pass the above test.