both countries decide an allocation based on supporters and ground sizes , i believe minimum is 10% dependent on segregation and policing etc , hence the questionnaires , and if we gave England 100000 , as long as we got 10000 in return then why not. We always end up with some supporters in home end as we are welcome anywhere we travel but i believe , correct me if i am wrong , but it is an offence to enter the wrong end knowingly