Have you seen the new costs yet?
www.royalmail.com/sites/default/files/RoyalMail_OurPrices_April2013.pdf
I think they are going to have a significant impact on private sellers who sell fairly light, small items like used kids clothes
Basically small packets category is gone and is replaced with small or medium parcels. A medium parcel is anything with a thickness greater than 8cm and is double the price of the corresponding weight small parcel. A small parcel up to 1kg will now cost £2.60 second class.
Also rather sneakily they have cut the amount of compensation provided as standard for a non signed for packet. It will now only be £20 rather than £46 as is now. So they are pushing you to use the signed for service which seems to add £1.10 to the standard postage cost vs 95p now.
Sigh..........
At least letter costs remain unchanged. I will be trying to squeeze more things in as large letters to keep postage reasonable.