Nick is right. We want to shape the disc after it has been cut so using Hardox is out as you can't machine it.

It also seems that S7 is hard to come by in the UK. We have contacted around 8 different suppliers and only 1 said they could source it if we needed it where as most can get H13. That said we only need it once and we have almost a whole year to get it done.

That is a good point about the hardening. I suspect most companies in the UK will know how to treat H13 and not S7 even if they are very similar.

And Motorama is on my list too. I was eye balling Moros as the coire design of Binky at one point.