I think you'll find, regardless of where authority lies at any particular time, if the Captain does not comply with an ATC instructed diversion or Police instructions when on the ground, the consequences could be very serious.
If I was that Captain, with 2 fighters up my chuff, and the Police / SAS welcoming committee, I'd do exactly what I was told!
Bon Chance, to those who wish to do their own thing and try their luck.