paypal postage labels not accepted at postoffice

Is there a reason why some post offices won't process prepaid Paypal  Royal Mail postage labelled packages?  The tracking number seems to come up automatically on Sold listing of the item on ebay when the label is purchased so is there a need for a paper Post Office receipt anyway to prove posting?  Advice please.

View Entire Topic

While I am sure Post Office should accept these labels,it all eally depends on how a small Post Office gets paid by Royal Mail.

 

Post Office has a long queue, you take in your parcels which they have to process and for their trouble no cash changes hands, while the paying customer have to wait.

 

If PO gets paid based on Turnover I can understand why they are not keen to accept business that produces no Turnover.