Post Office parcel dimensions and prices

I got caught out on Monday when the post office told me that an eBay parcel I was sending would cost me over £8. I asked if I could repack it and the lady showed me the dimensions and I saved over £5 by just packing it in a flatter box.

On the Post Office website they have all the prices and dimensions, but I can’t find them in one place so I have decided to put them all here for you, so that you don’t get caught out like I did.