Smart Family of Wealdstone -Military Man

[snowybeatle]

Hello everyone.
I'm trying to establish the identity of the soldier on horseback. It came from a box of photos belonging to my late mother and is likely to be either her father, or any one of her five brothers, all of whom were in the British Army.
Her father (my grandfather) was born in 1879, so if the photo is from the WW1 period, it's possible that the soldier in the photo is too young!
The brothers were born in 1902, 1909, 1910, 1914 and 1915, if that's of any help but a regiment will certainly help.
Many thanks in advance for any clues.

[Treetotal]

It looks more like WW2 to me as I have one similar, but I could be wrong.
Carol