George Lawrence Singer Royal Army Medical Corps

Hi,
I am trying to find out any information on my late granddad who served in the R.A.M.C i have attached his service record and would like to know if any other documentation exists such as war diaries, muster rolls, photo's etc.
i don't even know where he was born although i'm sure he came from Burmese extraction as he served before and after the war with the Rangoon Police.
any help or pointers reference the above would be gratefuly appreciated.
Thanks
Dave