Spectral wrote:You'll find that all mail is insured as long as you have proof of postage. Only downside is that the value is capped at something like £30 iirc.
I think the only option would be to claim it back from Royal Mail as it's their fuck up. Although I'm not sure if 2nd class parcels have any standard cover. Did you pay for any insurance on it? Even if the buyer is pulling a fast one I'm not sure you could do much as you'd have to prove it.
Here is the relevant bit of the Royal Mail website -