Looks like he was a Second Lieutenant in a Fusilier Regiment however which one is the question. If you could post up a high res' image of the cap badge it might help in saying which one it was.
It could be the RF City of London but it greatly depends on what is shown on the centre of the badge, how many flames and also which way they are facing/pointing . The badge of the RF City of London Regiment had a rose set within a garter in the main body of the badge, and within the confines of the garter there would be a motto.
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