ID this illustration, please

As I mentioned in my reader interview a couple of months ago, my stepfather was at a literary event when Judy Piatkus gave some novels away to promote her then recently-launched publishing company Piatkus [at the time, it was Judy Piatkus Ltd.]. He brought them home with this idea of donating them to a local mobile library bus. The cover of Diana Brown's Come Be My Love immediately caught my attention, so I nicked it off the pile. Although I nurse this long-time love-hate relationship with Come Be My Love [I'm quite shocked that I still have this copy ... fuck, my copy is 22 years old!], I love the illustration more. I have wanted to put up a scan [as I never found any online], but our scanner is royally f.ed and we never got round to sorting out our digital camera. Well, now, it's sorted:

[click on image to enlarge] On the back of the jacket, it says the illustration was obtained from the Mary Evans Picture Library. I contacted them a couple of years ago for details of the illustrator. They didn't have any details. Ah, well. [For those who love looking at fashions, illustrations and daily scenes of the past, the MEP library is the place to go.] It looks to me it's a 1920s illustration?