Ah that's interesting. That some of the 1st remained in Jersey.....good to have the comminding officer's name too, more research!
Not sure that's the same Russell in doc above. He was definitely a Captain around 1924 and I think was a Lt during his time in France. Just thinking, maybe Col Jones went to Ireland and Russell's men were left in Jersey, hence my chap being a cook (or Chef as the family say). Otherwise surely would be odd for a Captain to have his own cook, even if he was a Lord.
I'm hoping his papers say more when we get them later this year.
But thanks so much for all the information you've found, it's brilliant and helps me write up his story.