I would be very careful and get agreement to export before you bid, Alistair.
Soon after Brexit I won a bargain rarity and the private seller tried and failed to find a courier, so I lost it.
A dealer friend wouldn't send an airgun because of the paperwork hassle.
The only success I've had in recent years was when a friend who works in Germany agreed to bring an airgun back to the UK in his car.
I've given up buying on eGun now.