UK appleID afaik. Bu you’ll need UK credit as well. Maybe someone over there could buy you a voucher? I’ve never got anything from the UK store, not even a freebie, but I imagine that is how its done,
 OK I can confirm that getting freeibies from the UK store is easy. So you’ll just need to sign up for a UK ID, and then if what you want is a paid app, start looking about for UK itunes vouchers.