Depends
when you're comparing with, I suppose.
Royal Mail changed its pricing structure a couple of years ago. They removed some weight brackets, so some parcels fell into a higher price band. They also introduced pricing points based on the dimensions of a parcel, not just its weight. This had a similarly inflationary effect. A friend of mine has a small home-based craft/modelling business and does a lot of mail order. He has switched almost entirely away from Royal Mail to the independent parcel companies which offer far better rates and will even collect from his door. I believe there are price comparison websites for delivery services, so do a search.
I've heard eBay have fixed P&P rates for some categories of goods, and a lot of sellers complain they are obliged to charge less than the cost of carriage for P&P.
Ebay have also begun to crack down on the unscrupulous sellers who claim all sorts of time/admin/petrol costs within their P&P charges. This is a breach of eBay's seller agreement. A seller may charge for the actual cost of carriage (ie. the stamp) plus a small amount to cover the cost of packaging materials. But there are still some sellers out there charging £5+ to shove an item in a 3rd-hand jiffybag and slap on a £2.80 stamp.
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