http://www.caa.co.uk/docs/33/LASORS_06_WEB.pdf
Ladies/ gents:
Don't guess - buy or download (it's free) the above. It will tell you what you need to know in most cases. In this case, find F1.4 - revalidation of an SEP class rating and it will spell it out.
LASORS is very easy to navigate once you use it a few times and being an official publication, it isn't subject to the guessing (all be it educated) you sometimes find on PPRuNe
