I'm hoping somebody ie Elvis, Owdhammer, Stokemaverick MAY be able to id the race-course or the trainer or jockey (or even the horse)! I know it's an old photo and a bit of a long shot, but you never know:-)
From the dress you can narrow it down to between about 1925 to immediately the war, so that narrow it down considerably. You might be best off identifying the colours the jockey is wearing and working backwards from there, I'll have a go for you later and see what I can find but I'm busy just now.
Howard, had a go but tineye couldn't find anything.
Elvis, I said it was a longshot. Some of the buildings at Bangor on Dee STILL look like that!
Nox, I agree about the colours. I might ask The Racing Post. I hope you discover something later. Meanwhile I'll have a trawl too.