No, the Temporary Certificate is only for new Ratings (whilst awaiting their initial issue).
Skills Test is a term used for both Licences and Ratings
"Skill test’ means the demonstration of skill for a licence or rating issue, including such oral examination as may be required."
Technically, after a Successful PPL Skills Test, the candidate could be issued with a Temporary SEP Certificate by the Examiner - but this would be useless as they would not hold a Licence until the CAA issued it (complete with actual SEP Rating).