Renewal v Revalidation
You say 'so validation date is.....'
The date on which your class rating expires is stated on the validation slip incuded with your licence. Check that, don't summise.
If you have gone over the stated date then you have expired and must renew your class rating. The only way by which you can renew a class rating is by a test with an examiner.
To revalidate without a test, you must;
During the 12 months leading up to the SEPL expiry date have;
1) minimum total time of 12 hours as pilot
2)6 must be PIC.
3)1 hours dual flight training (logged P/ut) undertaken in one flight with a JAA Flight Instructor who must endorse your log book to say that the flight has satisfied the class rating revalidation requirement. (any test for any licence rating issue or renewal exempts you from this requirement)
a)You should note that the fact that you have flown with an instructor for whatever reason is not good enough without the instructor statement and signature - make sure that you get both next time you fly for one hour or more dual with an instructor. A simple signature is not enough
3)12 take-offs and 12 landings logged (in most cases this is obvious.)
4) Your class rating can only be re-signed based on experience prior to the expiry (up to 3 months early is allowed)
A club checkout does not count as the one hour dual training. However, more often as not the instructor will consider that the work done during the checkout satisfies the dual training requirement.