Forced delivery payment on monthly animal medicine

unforeseen

My take on it is that OP still has subscription but the only way to get it is for it to be sent by post. 

Probably because the vets have not implemented a collect at door system, I'm guessing because it is now unmanned and only visited when needed. 

hollydays

Maybe they are too busy and too short staffed and dealing with a backlog of sick animals

IvanOpinion

Or maybe their normal supplier cannot provide the product, so they order through a different supplier but to get it to you quickly and safely they get that supplier to send it to you directly (the £2.50 being the charge applied by the supplier)

shaun_from_Africa

hollydays said:

You could see if you can order the medication online cheaper.Your vet will give youthe prescription

They may well make a charge for issuing the prescription bu even if they do, the online saving may still make it worthwhile.
The vet I used to take my pets to initially charged £5 for a single prescription and this gradually increased over the years and by the time I left, they wanted £20 for a prescription that was valid for 90 days.