I would imagine he can no longer sign autographs personally because of his deteriorating vision. I read recently he suffers from macular degeneration. Definite legend, and you ought to treasure that autograph because the man is a British icon - he's Wallace!
Autographs Received - Gordon Ramsay, Michael Emerson, 42x Eastenders, Sue Nichols, Bernard Cribbins, Derren Brown, Michael Palin, David Walliams, Terry Jones, Dame Judi Dench, Matt Lucas, Johnny Depp, Dame Edna Everage, Adam Ant, Sheila Hancock, Craig Charles, David Tennant, Daniel Craig, Diana Vickers, Nick Frost, Bill Nighy, Bonnie Langford, Rupert Grint, Birdy, Dick Van Dyke, Robin Williams, Rik Mayall, Amanda Seyfried, Nigel Planer, Emma Thompson, Bruce Forsyth.
Autographs In Person - Russell Floyd, Amanda Drew (x2), Duncan Norvelle, Chris Tarrant, Sam Fox, Bill Oddie, Coleen Nolan, David Baddiel, Pat Cash, Mike Rutherford, Roger Taylor, Ben Elton, Russell Kane, Tim Minchin, Noel Sullivan, Simon Weston, Julian Clary (x3), Brian May (x6), TOWIE's Lil Chris & Mario, Jimmy Carr (x2), Sean Lock, Al Murray, Alex Ferns, Jason Manford, Jack Whitehall. Waiting For - Absolutely oodles.
This has been the proper contact address for quite some time....HOWEVER:
His agent's office has been sending out those pre-printed signature photos for several years now, due to (no doubt) our beloved Mr. Sallis's Macular Degeneration.....and he is 92 years old, after all....
Back around 2001 > 2002, I had a very brief running-correspondence with him. I received three hand-written letters and a signed photo with each, including a personalized, uber-rare 8" x 10". Those days are gone, I'm afraid.
"Peter Sallis Absolute Number-One Fan"....and I'm from the USA!!