Hi KidInk,
Just wondering why you think you need to visit the flying school during the week to "send off...(your)...stuff"? I'm assuming here that you will be applying for an EASA PPL(A), rather than an NPPL?
Nowadays there is normally no need to physically send anything to the CAA. The application is submitted over the Internet, all they need is the completed online form, some kind of payment card details, then scan and attach certified copies of: your ID, course completion certificate & examiners report form.
See here
Initial Application for a PPL(A) Licence | Private Pilots | Personal Licences and Training
Your flying school should be able to arrange all those things for you, either by email or post, maybe even drop off/pick up at a weekend, if the person who certifies things for them is only available Monday to Friday.