Well that's Shelsley Walsh and, unusually, there are no spectators crowding against the railings!
Therefore it must have been a amateur meeting I think, so I've looked and it seems to be H.V. Cooke in the HNT Special in May 1928.
As I'd never heard of the HNT Special I assume an anonymous contributor's comment that it had a Sage engine is right. I think the car was made by (or for) H.N. Thompson, hence HNT