Whilst the HAC might appear to be part of the RA, they are a separate entity and now a specialist unit. Officers would therefore have had HAC after their names, whereas Gunner officers had the RA moniker after theirs.

The RA is one of the largest support arms of the British army and is, I suspect, of limited help in tracking down the correct individual here. That's why I feel any Cornish connection may prove to be more pertinent.

Tim