I sent a letter to Dan Aykroyd on 1-23-2013 and got a signed picture and notecard back on 2-22-2013.

Dan Aykroyd
C/O Applied Action Research Corp.
859 Hollywood Way, Box 497
Burbank, CA 91505

I sent a letter to Judi Dench on 1-26-2013 and got a signed picture in the mail today.

Judi Dench
Dame Judi Dench
Julian Belfrage Associates
9 Argyll Street
3rd Floor
London, W1F 7TG
UK