Are there any good UK manufacturers using British steel for an EDC?

In what sense? Multitool? Knife? Knives, yes, there are knife makers in the U.K. who forge their own blades, some make UK legal folders.

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I’m certain Ben has made a simple non-locking folder, but it’s not listen on their site.
There’s a bunch of knives here, but most probably use foreign steel, Spyderco often use Japanese steel on their knives.
https://www.thebushcraftstore.co.uk/folding-knives-76-c.asp

Sorry, yes a knife. Something along the lines of a Spyderco UK penknife but British.

Not quite like a Spyderco penknife, but there’s a whole bunch of Sheffield made knives of various types here:
https://www.sheffield-made.com/acatalog/Pocket_Knives.html
This one is rather nice, that shape of blade has become quite popular recently, and a handle with rosewood scales and nickel bolsters for that price is pretty good.
https://www.sheffield-made.com/acatalog/2-Bolster-pocket-knife-132_2_bolster.html#SID=19
More to be found here:
https://sheffield-gb.com/Sheffield_Made_Knives/Sheffield_Knives_by_Trevor_Abl/sheffield_knives_by_trevor_ablett.html
https://www.penknives-and-scissors.co.uk/acatalog/Pen_and_pocket_knives-p1.html

Got a new Benchmade mini-bugout and Rovyvon A8 flashlight (keyfob shown for size comparison)

The mini-bugout is a cracking wee pocket knife, very light and decent blade length, shown next to my old kershaw od-2 for size comparison, slightly larger and more secure/useable than the od-2.

The Rovyvon A8 is seriously bright for it’s size at 650lumens but more importantly it has various modes and battery life is very decent – charges by mini-usb.

Those little flashlights with USB charging are becoming more common, which is a good thing, saves having to keep a bunch of spare batteries charged up. I’ve just bought a NEBO light from Heinnie for work, it’s like a penlight, with a COB light on the side, a regular flashlight on the end, and even a red laser pointer built into the clip! Cost £18.99, and it’s ideal for doing vehicle inspections when it starts getting dark, the COB light gives a flat flood of light, great for picking up small dents and scratches. Micro-USB charging, so I can just plug it into my battery-pack during lunch to give it a quick top-up.
https://www.heinnie.com/nebo-trio-flashlight-laser-pointer

Looking at a Damascus steel Chinese chopping knife. Not an EDC obviously, but my question applies across the knife board. How do I maintain the specified 30° (15 EA side) by hand? It really seems like a black art maintaining a keen edge.

This sharpener here is pretty foolproof and easy to use, ,

Edit : forget the lynskey above as I see you specified 30 degrees, no experience of This Spyderco here but gets good reviews

30 degrees doesn’t seem right, most kitchen knife edge angles are between 17 degrees and 22 degrees – those Lansky sharpeners are excellent, I’ve got one, and there’s another that has a pair of diamond coated sticks for getting an edge on really dull knives. They also do a neat little keyring sharpener with very small ceramic sticks the cross over, for sharpening either very thick blades, or very thin ones, set about 20 degrees, it keeps a very good edge on my knives. Only about a fiver, I think.
Yeah, here you go, £5.95 from Heinnie;
https://www.heinnie.com/lansky-mini-crock-stick
Maybe not to the sort of standard where you can cut paper-thin slices from a tomato without holding it, but that’s just showing off!