Indeed! But "Jewish" seems to be a neutral characteristic for Streatfield - remember Uncle Mose Cohen in Theater Shoes? He was probably one of the most reasonable people in the entire story, as well as being a "successful music hall star." I was always very pleased with his first appearance, where he gives each of them a generous money present for Christmas and says that what he'd prefer they do with it would be to buy books, but that it's their own, to spend as they please.

(There's also Benjamin Bettelheimer of BB Productions in Movie Shoes, but he has basically a walk-on part.)