Winston Churchill Lancaster boxes?

Wotcher chaps,

I had a tin of 4 Winston Churchill Lancasters a while back. I really liked them, and would like to buy more. I haven't been able to find anywhere that sells more than the tin of four sticks, does anyone know if and where I can buy a box of 10+?

I can always buy multiple tins, but I was just curious. Fabulous Dominican Belicoso, if you haven't tried one.