You say you live close to Oxford in your opening post.
I reckon if you take a utility bill down to the stadium as proof that you live close by they will sell you a ticket in person for the home end.
Its a GL postcode mate, its close but I'm sure there are Coventry CV postcodes in South Warwickshire that border OX postcodes that are closer than me so seems a bit pointless saying i'm close. That might work but if not its a wasted trip to Oxford