I've almost sold something on Gumtree and they are asking me to post it - I'm happy to so long as I get proof of delivery - but I can't work out the Royal Mail webby.
My parcel is 1450g. It measures 30x23x14cm. I want the cheapest option. Can someone tell me please?
Also, I don't have a printer, so it needs to be a service I can get at the PO. Cheers.