I'm really torn here.
On the one hand, I'm not a big fan of non-canonical Holmes stories - exceptions, which I don't expect anyone to agree with, include Sherlock (because it's a very, very witty pastiche, and it's saved from over-cuteness by having only about three episodes every two years), Murder By Decree (just because), and A Taste for Honey (the 1940s novel, not the dreadful 1960s film made from it). And maybe The Seven-Percent Solution (again, the novel, not the film).
But on the other hand, I'd probably pay at least senior-discount prices to see Sir Ian read the Sussex voter rolls.
So we live in hope.