This is a photo of my grandfather, Frank Leslie Hill, b.1903. To the best knowledge of the family he did not serve in the armed forces. However we have found this photograph of him and wondered if anyone can help with the identification please?
Based on @Adrian's answer, I have found the following for the Middlesex Regiment:
I've also found a medal roll, but this is dated 1915 which would make Frank only 12, which I find hard to believe. Any help to find any more detail to prove/disprove would be helpful.