Thanks! That UK manufactured one looked "too good" to be a commercial reproduction. Plus, coveralls are not popular surplus items so it seemed doubtful a company in the UK would make fake coveralls.
Although it was once normal for European nations to purchase clothing within their own nation, budget issues have lead to more foreign competition. At the very least to keep domestic manufactures "honest" through competitive bidding. I have an official Dutch Army boonie hat submission from a German company even though at the time (I think) all items were made by Dutch companies. I've also seen Belgian submissions to UK and Germany, even though both of those nations make their own clothing.
Of course this all changed in the 2000s with outsourcing. Now it's anything goes