Wyn and Ivy Black (Adams) of Brixton: Musical stars of the 1930s.

[Rattus]

In 1956, the electoral roll has a Lydia Sherwood at 10 Bray House. She is also shown at the address in 1945, albeit as one of many occupants of 4-5 Duke Of York St rather than specifically at flat 10.

https://en.wikipedia.org/wiki/Lydia_Sherwood

https://free-classic-movies.com/movies-03/03-1934-08-24-Little-Friend/index.php

I hesitate to put this down in writing, feel free to shoot me down... could Lydia Sherwood be the lady on the left in this photo? Sometimes I see a resemblance, mostly it feels like wishful thinking. I'm leaving this part-researched for now, in case it's a wild goose chase.

Agree with Jim, seeing the back of the photo would be handy.

[Treetotal]

It looks like the "&" symbol comes down from the lady's thumb almost like a flower...There is also an exclamation mark so I'm wondering if this signature is a stage name...not that it helps. I tried to make it clearer too..looks like it could end in yna...or yn followed by a lazy kiss.
Carol

[ShaunJ]

Looks like " Wyn"

[ShaunJ]

Researching....

[ShaunJ]

This is Wyn and Ivy in 1929

(Leeds Mercury 5 January)

[Treetotal]

Wow!!!....great sleuthing Shaun, I think you've solved it    The date for this clip is 1936

Carol

[Greensleeves]

Oh well done, Shaun!  Brilliant!

[Greensleeves]

A review from Hull:

...  Marjorie Stevens and Lewis Barber sing and dance pleasantly; the Melvilles are capable jugglers; while Wyn and Ivy in Mirthful Moments " are always amusing. Bob Lloyd again acts as host, while Betty Hill sings and dances .....   
04 April 1933 - Hull Daily Mail - Hull, Yorkshire, England

[ShaunJ]

According to Ivy's obituary in The Stage they toured with ENSA during the war so that may be how the photo came into Kevin's father's hands.