Yes, I've been known to beat up some steel on occasion. I try to base the ones I make on originals that have been found - from all the time periods they were used in - from early Roman times B.C. up to the present. I make/sell around 500 to 600 a year. And less than 10% of those are that classic C shape.
Today I made up 4 French style strikers from the mid 1600's. Yes, I only made 4 today, because I was concentrating on making up the parts for 2 Tourtieres - the early 1600-1700's French cooking/baking vessel before the Cast Iron Dutch Oven was invented. (Sheet iron pan with a sheet iron lid that has a lip forged around the top so than you can put coals on top to "bake" things with - just like those cast iron dutch ovens - which only became commonly available in the mid to late 1800's.)
A couple days ago I made up 4 Irish strikers. It's a little hard to identify regional strikers in the UK because they all tend to be just given that "British" or "English" designation in the museums.
But do jump over to the Firecraft sub-forum under Bushcraft and Survival Skills. There have been a number of message threads discussing flint strikers. There are probably at least a half dozen people on BCUK that make them. A PM to any of them should help you out.
And you might send a PM to Eric Methven. He got a large number of strikers from me a little while ago, in many different styles. On the Classifieds section he listed some kits with the Oval flint strikers. So you might check with him to see what he has left. Or even send me a PM. I usually have around a hundred strikers floating about - in dozens of different styles/shapes and historical backgrounds. And shipping to the UK by Internatinal First Class mail is pretty reasonable ($4).
Hope this helps. Check with some of the people around you to see what might be available.
There's also going to be a multi-period historical gathering near Maidenhead this weekend. I just saw it listed over on Eric's Mountain Man forum. I have no idea where that is or how close it might be to you, but would be a great place to see things in person before you buy. There are supposed to be a lot of vendors there.
Thanks
Mikey - that grumpy ol' German blacksmith out in the Hinterlands