Chris Staniland's Multi-Union. (The original photograph wasn't so good, so needed a fair bit of cleaning up, hence the delay.) I had to Google the correct spelling - i.e. one word or hyphenated. Although I know the car from these and other period pics, I didn't know that it was effectively a P3 Alfa Romeo. Needless to say, it has not survived in this form, but has been converted back to a P3 Alfa. There has been some debate about recreating it, using the left over bits.
Those of you who saw James May's TV Toy series and the Scalextric recreation of Brooklands, may just have glimpsed that some of the streets were named after Brooklands' drivers, one being Staniland.
When you see pictures like this, you can understand why modern racing cars (almost identical anyway) with totally hidden drivers, look so bland.