When I first bought a record from Barry Wickham, I was charged a lot more for postage. I spoke to a woman Marda, who I have dealt with since when buying records from there.
She told me the reason they charge more for a first time buyer is, they have been ripped off in the past by people claiming not to have received records. So, if your a first timer buying a record that's over £100, they would rather it be tracked. Whether it's true or not I don't know, but I decided to pay the extra as I wanted the record and I have been charged normal rates since.