Maybe not knowing the answer shows me to be stupid but that's OK as I'm well aware of that already, so if you wouldn't mind answering the stupid question that would be great.
You've posted up a list, unsolicited by anyone on the forum so far as I can make out, with the rules for inclusion arbitrarily set by yourself, but you haven't said why you bothered or why I should bother. In the post above you've simply alluded to 'ignorance' (twice) and said I should care, but haven't said why. I'm genuinely interested what you mean by "it will affect my diving" and "further if you continue it will affect you badly"?
Without an explanation you see I'm left to conclude that you either wanted to display some kind of arcane 'knowledge' as graham_hk suggested (for reasons best known to yourself), or make a 'jump' to some other answer I infer from your comments (on this thread and others) such as by "Made in the UK" what you really mean is you think we should all 'Buy British' (a laudable sentiment but not always the right thing to do), or that somehow this equates with "high quality" as all that foreign muck is made to a price and will fall apart as soon as it's unwrapped (which will be correct in some instances and woefully incorrect in others). Your previous references to the 'pile-em-high-sell-em-cheap' places like Primark and Aldi would perhaps fit with this hypothesis (I'm having to make 'jumps' of course as you won't spell it out for thickos like me).
Please explain (clearly and without obfuscation or any derogatory remarks) why you think I should care what country my diving equipment is made in any more than I care where the car I drive is made or the computer I'm typing this on, or the wee Chinese-made Bluetooth dongle that just dropped through my letterbox via Amazon (a US company btw)?? What's so special about the diving equipment industry that its demise in the UK is to be lamented any more than all the other manufacturing industries which have gone east? Please explain why “it will affect me badly” if I don’t understand the importance of not paying 50 squillion quid for a "quality" item made in Britain at the rate of 2 per week by some old codger in his shed (who sources all his parts/raw materials from abroad anyway!) rather than a few bob for a mass produced Chinese one that will do at least as good a job and if it breaks after a few years I can just buy another one for another few bob?
If it's about supporting British jobs fair enough. I'm all for supporting British jobs. But let’s support the jobs we’re good at and where we're competitive in the world (and that's obviously NOT dive equipment manufacturing going by your list!). We can't be self-sufficient and we can't be good at everything. Some things are just better sourced from abroad and it would seem dive equipment is one of those things. Shame but there you go.
And what exactly does "made in the UK" mean? How far down the supply chain do we go? Should we not maybe have "Assembled in the UK" instead? Or "Designed in the UK"? Or "Based in the UK for tax purposes"? "Made in the UK" (or "Made" anywhere really) is almost meaningless these days as nearly all manufacturing companies have a global supply chain if you drill down deep enough. It’s just a badge. A marketing illusion. We are all intertwined and interdependent.