cheechm,
If you flew with an instructor yesterday and he was happy with your performance, let him validate this outcome by completing the rating page of your licence. That is it. You don't need to fly again.
!! Make sure the date (yesterday's date) is the date the instructor inputs into the rating page.
However, if he/she (the instructor) does not endorse your rating page, and your licence expires tomorrow, you will need to get an authorized CAA examiner to perform a renewal test (revalidation is not possible anymore).
WP