Do take care to keep evidence of your exam passes. It is not unknown of exam passes to get mislaid if somebody leaves a school and goes to another one. They can be mislaid accidentally, or less than accidentally. I had to do a resit of one lost exam.
Schools also go bust regularly so if you sat some exams at one school, and complete the PPL a year later at another, the original one may have gone bust in the meantime, with the likely loss of all records.