Brilliant quiz, Sherlock!
1. Peter Jeremy William Huggins
2. The label of his first suit
3. A hand double, he was left handed and Sherlock right so he needed someone else to right things close up
4. .
5. A jockey but he was too big
6. He was the only actor on a real horse
7. Robert Stephens
I just couldn't find an answer for question 4, I'll do some more research...

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I was wondering if you'd like to have coffee...
Hmm. I really don't know. Oh, I'm sorry, did I say 'know'? I meant 'care'. I don't really care.
Douglas Richardson, Cremona