The problem is that bidders are automaticly blocked that:
Have a primary shipping address in countries you don’t ship to.
And it is difficult for the seller to change this.
So I allway ask permission to bid form overseas.
Than I make a fake UK address my primairy shipping address and no blocking.
Because you can't change the Paypal invoice the seller will have to sent you a new Paypal invoice with the international shipping costs.
There are some checks in Ebay for postal code and format of the phone number. I use something like:
0 Fake Address
overcoming Ebay block
London London E98 1RL
Verenigd Koninkrijk
(207) XXXXX67
For Germany it is the same solution.