Recorded, signed for, costs less than a quid, as the sender/seller, you can track online whether the goods have been delivered/signed for or not.sorry for no contact, but i did not look at the post as i sent the item standard post as agreed with you, and never looked back thinking you would receive it fine .
i will contact royal mail and let you know via this post tomorrow morning
If the buyer has not received the goods, then the seller has to refund the amount in full to the buyer, and file a claim with the post office or courior.
I always send insured to cover myself. If the item is less than £50, i use recorded delivery, anything above that i make sure it is insured to the correct amount.