Features that I think may help to identify this are the lights on stalks next to the windscreen, and the number of air vents in the engine housing. So far in a few random searches I haven't seen anything quite like either, and I don't know enough to be able to pin those features down to a particular make. The shape of the radiator and its cap are often also quite distinctive - I'm not sure this one is rounded enough for a Morris Cowley ("Bullnose"), but that area of the photo is a bit indistinct.
I did wonder about a Wolseley, and there are a few similarities, but nothing conclusive. A lot of the Wolseleys I found had a much larger/wider bulkhead (?) between the bonnet and the windscreen/dashboard, whereas the lines of this one are a lot smoother. Some Alvis models show similarities too, but I haven't found any with lights next to the windscreen.
Arthur