Hi Ken
Thanks for your response. I'll e-mail your questions to my pal and see if he can help although his knowledge of this - his maternal - grandfather is rather vague. He has given me the attached photograph this morning and it would seem to confirm, on magnified inspection, that the cap badge is that of the Border Regiment. He also seems to be wearing spurs!
Either in, or returning from, Gallipoli, Charles contracted malaria and was disembarked at Gibraltar as it was considered he would not survive the remainder of the voyage to the UK
I'd trawled Ancestry for his records as well, but to no avail. I'll ask about the marriage record and try to convince him to buy it. However, if it's like our Scottish ones, it may just give his rank and not a mention of the regiment. Watch this space!
Regards
Chiad Fhear