Presumably you meant renewing, not revalidating in the first post - ? revalidation implies you are already valid ... renewal , meaning lapsed, currently undergoing refresher training is what I think you meant ( and did say in the second post) ? in which case - its not clear what licence you originally held so its a bit hard to answer... but heres a couple of thing that might help, assuming that you hold an EASA Private licence
If you pass the proficiency check, the examiner will endorse your rating with a new expiry date by signing the relevant section of your licence and entering the new date.
see here:
https://www.caa.co.uk/General-aviati...ratings-valid/
and when you apply for the night rating you will have to state the expiry date of your ratings on the night rating form
https://publicapps.caa.co.uk/docs/33...e07enabled.pdf
And then these will be updated on the new licence when it is sent to you
And you'll need the licence & medical to be valid for the solo part of the night training