'Gertrude the Wombat' - it would be very unusual for you to have to take the entire JAR-FCL PPL(A) Skill Test 'to get your PPL back' unless the CAA has directed you to on an individual basis.
If your SEP Rating has lapsed, you should normally only need to renew it by flying a 'SEP Class Rating Renewal Proficiency Check' with an Examiner. There is NO mandatory navigation content in this check.