I think the best way of doing this is to go back to the training organisation where you did your PPL and get them to apply on-line with you. That way, they can check that all your application details are correct and their HoT/CFI can certify documents as required. If there are any snags, such as insufficient hours or exams out of date, that's the place to sort them out, not leave it to the CAA to have to e-mail you and then join the back of the queue. We had one on-line application recently where the applicant got their licence back within 3 weeks - much quicker than postal applications, apparently.
TOO