Ordered an item online which was sent via Royal Mail; as it didn't arrive, the seller kindly sent a replacement. Eventually, the original order, very much eventually, turned up followed by the replacement item. I informed the seller and offered to return one of the two identical items. The postage charged to send each identical parcel to me, second class large letter, was in each case £1.55; returning one parcel, second class large letter, no change in weight, packaging or dimensions cost me £2.60 at my local post office. Hmmm! Delay, inconvenience and overcharged. Really doesn't pay to try and do the right thing.