I was trilled to see your post.
I am researching the Dench family - Sidney John (snr), Sidney (jr) Dora and Bertram. My husband's maternal grandfather was Sidney (jr) and his wife was Lydia Whitfield k/a Cissie - his mother was Mabel Dench also an actress k/a Toots. There were apparently two further generations of Dench actors further back.
We would certainly be very interested in any materials you might have on the Denches. I have been scouring the net for information on them as Bill as very little. We found Bill's cousin and Bertram son last year. Bill had no idea he existed and vice versa. They met for the first time last July.
We are very much looking forward to hearing from you.