Just seen the other post, so its metal replica. yes there are laws on selling and buying which come under the VCR act, i would suggest you read up on it, but basically if you sell it you need to make sure the person buying is VCR exempt, if they are not you cannot sell it to them.
price wise its very hard to say it always depends how much someone wants that particular model. If you buying retail i would say £130 to £150, so selling privately you would expect to pay less than that