Andy Murray has a blog. This is the guy who says that he wears a Paraguay top and states:
"I'll be supporting whoever is playing against England. I am a typical Scot."
Why not leave a comment on his blog and inform him that you'll be supporting anyone but him? Be polite though, we wouldn't want England to get the same reputation as Scotland.

Meanwhile, Franz Ferdinand star Nick McCarthy, fellow mealy-mouthed Scot (albeit a plastic one), had this to say to a German magazine.
"I get stick from all the lads in the band but I know how to defend myself.
"If it comes to the two teams facing each other, I'll be supporting Germany definitely.
"When you live in Scotland, you really go off England.
"In fact, thinking about it, after living in Scotland, England's a bit of a sh**hole really."
Don't buy his records, they're shit anyway.