I would be amazed if you can. Worked there last year and to buy tickets (any tickets) you need to show a form of ID, i.e. passport or ID card. I doubt very much you will be able to tickets in the Inter End with a UK passport unless you are an official member of the Inter fan club and have the appropriate fan card (tessera del tifoso), you need one to demonstrate you're an inter fan if you have a non Milan address, see the note for Cagliari and Bologna fans:
http://www.inter.it/en/biglietteria
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