If you want to use Royal Mail 2nd class 85p you will have buy via Amazon Buy Shipping as any other method is NOT valid for VTR that is you buy it a Post Office then it be killer for your VTR rate Please also note that buying a book of stamps is also not acceptable to Amazon for VTR either,

Also you leave your self open to lots of Fraud with non delivery claims

@Seller_d8YGbIjNqwFxn @Seller_ZVAz3d5lZuGid

Yes, your best option is to definitely use Amazon's 'Buy Shipping', and as said, using ordinary stamps is a no-no.

Second Class via Amazon Buy Shipping. It's the same price as the Post Office and buying from Amazon gives you a VTR and A-Z Claim protection.

All depends on the cost of the item you are selling to be honest. if you are sending out using Amazon and using anything that's not tracked you risk leaving yourself wide open to non delivery's.

I send between 100 and 200 items each day using Royal Mail Letter (85p Cost). All Brought through Amazon Buy Shipping.

As others said if you opt for this then your only choice is to buy through Buy Shipping to keep to Amazon Policy.

As it is an untracked service you do find that some customers claim non delivery. You have no proof whether it is delivered or not so you either refund or risk an A-Z if you don't.

However I find less than 1% of my Royal Mail Letters have non delivery claims for customers.

I actually have more claims for Royal Mail 48. Whilst this service has a delivery confirmation scan you find in practice that Royal Mail sometimes don't scan the barcode on delivery which leaves you open to fraudulent claims.

If your items are expensive though you do leave yourself open to fraud using Letter Post so you may want to look at some form of tracked service.