Last month I was on little holidays, so I couldn't post my success earlier.
I sent a letter with self addressed envelope, my photo of Mark Webber to sign and IRC to Red Bull Racing.
I recieved my photo unsigned back, hand-signed cards of drivers and a letter.
In this letter they wrote, that Mark isn't in the factory often and can't sign this card. They also wrote, that even if Mark could sign it, it will be impossible to see, what photo is from what fan and send it back correctly.
(Hmmm... Lotus can do it without problems, so I think, guys from RBR need parctice

I used this address:
Red Bull Racing
Bradbourne Drive, Tilbrook,
Milton Keynes, MK7 8BJ
United Kingdom
SENT: 20.07.2012
REPLY: 02.08.2012 (after 13 days)

