not saying i agree with it and i don't think you have much say in the matter...this is VOSA we are dealing with
So, you turn up and present the vehicle for an IVA and they can crash test it before your eyes without your permission?
The clue is in the name -
Individual Vehicle Approval. It's a process for testing one-off and low volume vehicles where you don't have a car park full of them to crash test nor the resources to do so. All aspects of the vehicle performance are assessed non-destructively on the basis that only a single vehicle exists.
I can see no requirement for crash testing in the IVA manual (I'm reading it now), except that, if such testing has been carried out and compliance with an equivalent standard demonstrated, you can use documentary evidence of compliance to satisfy the examiner. This is important because, for a production car from abroad, you will almost certainly be able to do so. Failing that, the examiner's experience will tell him if a vehicle structure is adequate. If he's not happy, a report from a structural engineer might be used to demonstrate compliance. Data from the kit manufacturer can be used, for example. At
no time would an IVA specifically require a crash test before a vehicle is registered.
Now, if, as a kit car manufacturer, you start to exceed a certain production volume, or want to access markets where there is no "low volume" route to registration, you might need to go down that route. That's the only circumstance in which I would expect to see a kit car crash tested, so that'll be what you saw.