Selling an item to UK

[specyes1]

I have an item that a customer in UK wants to buy.  He says eBay will not allow to buy this item. I don't have any country restrictions on this item.  

[disneyshopper]

What is the item?  The only item I know for sure that can't be shipped internationally are knives and perfume.

[jonathanbrightlight]

There are many items that can't be shipped internationally, but I don't know of a complete list anywhere.  I know some toys & car parts for example may not be eligible to the UK, and the knives and perfume that @disneyshopper  are not eligible to be shipped to most (if any) international destinations.