I asked a question. It wasn't loaded. When I post, I usually do have something constructive to add. I did not know that you didn't file up the springs yourself, hence why I asked the question in the first place. You do say "we"a lot and in this country that usually means that you are actually involved in the work, not just acting as a subcontractor farming out the work to the trade. In that case we say things like "a client of mine has a broken gun, so I found a gunsmith to fix it."
Anyway thanks for posting the pics. It is interesting to see these springs made. I've seen Purdey mainsprings made by Alfi Galifent, they are beautiful and complicated. He used to make springs in batches too. Too much work to make just one. My friend here in the states has a small box of Alfis semi finished Purdey springs. I currently have a Lancaster body action with a broken mainspring. It's an extremely complicated devil with much milling involved. You could make it solely with hand tools, but it would be silly to. I would venture to say that the Lancaster mainspring might be just a hair more complicated than the Purdey.
