Today I for the first time heard of FV10. It is an organisation led by former F1 engineer Tim Preston, who prepared old GP cars (some Jaguars, Jordans and Super Aguris, with Cosworth engines). They allowed drivers F1 test drives.

I heard that the nVirgin test driver Andy Soucek and Luiz Razia drove some tests with a FV10 Super Aguri Cosworth.
Were there any other prominent driver on the street with them?

I heard that also Johnny Herbert and Martin Brundle are involved in that project.

Sounds like the plans of Anthony Hamilton and GP Prep.

FV10 also ran a Jaguar in EuroBoss with Klaas Zwart.

Any possibilities to contact them?
Any more details?

Try this page FV10.

Here is their 'official' pdf with contact details :-)

As the chassis dates to 2006 I suppose this just qualifies for "History" or "Nostalgia"

Thank you; I already know this page, but there is no answer, who else drove with that cars...
For example famous driver (I think Herbert was in one of the Jaguars) or young drivers, which perhaps in future could enter F1 and tried to do it with FV10, like Soucek and Razia did it.

I understand the FV10 deal is that 'business customers' are supposed to buy the cars and and pay FV10 to maintain them for whatever series they are run in and also 'the owners' are then supposed to hire them out for corporate track days no doubt in an effort to recoup a small portion of their investment.

Which ever 'name' drivers have driven these vehicles, they appear to have done so purely for the purposes of testing that they are safe, easy to handle and giving one line quotations extolling the virtues of the vehicles and the FV10 business model.