@Filek thanks for replying on this.
MacBaren acquired the J&H Wilson marque from Imperial in 2015, along with a number of other marques previously owned by them, see: https://pipesmagazine.com/blog/pipe-news/mac-baren-acquires-brands-from-imperial-tobacco.
Current production stickers, on the back of the tap tins at least, note “Snuff Made for MacBaren Tobacco Company.”
I am increasingly thinking that Sharrow Mills is making it for MacBaren at the moment, even through the production batch codes on the labels seem a bit odd as per current Wilsons & Co. produced snuffs, e.g. “150 20A” or “T019D” on a current SP 1 and Top Mill respectively. However, there are edge sealing labels on these tap tins which do not appear on other Wilsons & Co. tap tins that I have seen recently, and the color of the plastic base is different from all of the other Wilsons & Co. produced tap tins I’ve seen as of late (navy blue vs. black).
I couldn’t find a listing in the usual UK gov. registry docs. for current UK-made tobacco products, though, so am just guessing re: Sharrow making these for MacBaren however.
I am sure someone here knows, and will weigh in eventually as to where they are being made at present.