What is his cap badge ?

[SIDINSIR]

Hope someone can help with this cap badge - my best guess is London Rifle Brigade ?
Screenshot 2020-09-14 at 19.38.16.jpg
It's taken by John Bailey , a local photographer in Southampton who disappeared from the scene after 1907. My best guess it was during Army camp held on Southampton Common in 1904 /1905.
A whole British Army Corps was gathered there for training , with Sir John French leading the "enemy" side.

[Bill A]

Hello SIDINSIR, welcome to the Forum. Your account is active and open for posts.
The membership should be able to assist with your identification.

[cbuehler]

Just can't make it out clearly enough, but it is not the London Rifle Brigade.
It has a six point star design which could indicate several regiments, rather more like the Devons or RASC in my opinion.

CB

[oc14]

He is wearing the cap badge of the Army Service Corps, the three tier shoulder titles are of a pattern that was introduced in 1908.

PL