At VeloSolo we distribute our own range of UK made precision bike components including drilled disc hub mount and standard threaded cogs as well as chainrings, handlebars, tools and associated components. All UK manufactured and designed from start to finish - solid cro-mo steel bar and various aluminium alloy stock into the machine shop one end, finished components out the other.
We are based in the south of England and ship worldwide every day with customers in over 60 countries and across the USA.
Both above reads together as bad news.
If Velosolo branded parts were produced in UK specifically for Velosolo, then without Velosolo no further production.
And it could even be that the company producing the parts itself stopped, with Velosolo's stopping as a consequence.
And people that buy them in the UK from all over the world, means they didn't find the parts elsewhere.
= grim outlook to find in the future bolt on cogs with the same specs.
For ex on Amazon I find "16T Fixed Gear for Bicycle Disc Brake Mount Bolts-Fixed Chain Wheel 6 Screw Disc Hub Convert to Fix Gear Single Speed Fixed Cog "
It's listed as 1/8", so for wide chains.
The material specification is nothingsaying commercial rubbish: "heat-treatment steel"

So let's look at the weight, they DO list that: 38 gram
Now look at Velosolo:
https://www.velosolo.co.uk/weights.html
VS Disc Cog (cro-mo) 3/32" 16t = 30g.
VS Disc Cog (cro-mo) 3/32" 18t = 48g.
VS Disc Cog (cro-mo) 1/8" 16t = 50g.
VS Disc Cog (cro-mo) 1/8" 18t = 68g.
VS Disc Cog (7075-T6) 1/8" 16t = 18g.
VS Disc Cog (7075-T6) 1/8" 18t = 26g.
Notice the big weight difference between 3/32" and 1/8": 30 gram > 50 gram
The Amazon product is 38 gram, so it's closer to Velosolo's 3/32" than 1/8".
That's a plus of Velosolo: they let customers know what they buy. No nothingsayers like that "heat treatment steel" and limited data, but the full specs.