So what's a difference between "Oreca built spaceframe" and "M-Sport built spaceframe, but it kinda looks like Ford".
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This is a loaded question. The permit itself shouldn't be expensive in the grand scheme of things, perhaps having the staff to do it all would be.
In the UK should be similar to EU, anyone can build a car at home and get it approved for road use but it has to be inspected at a cost to check it meets minimum standards. A manufacturer can produce up to 500* vehicles per year this way but each individual car built must be inspected. I imagine this is what the kind of outfit we're discussing would do
Or, mass-manufacturers can go for type approval, meaning only one gets inspected in theory, and they then make however many identical cars. But really everything about the manufacturing process is inspected, this requires a lot of effort, documentation and a lot tougher standards of safety, emissions this kind of thing.
A spaceframe rally Puma, whoever built it, would be seen as a completely different vehicle to normal production Puma, as it doesn't conform to the type approval standard. It's just shared branding. Kenneth is right, there's no difference between Ford or Oreca spaceframe cars.
*I've read 300 elsewhere from the same Government agency that does it.