Chris, you thought it was the regulator so you first checked the plugs?
I guess I understand why it is done that way with the ECU not allowing fuel flow when leaking, or the inertia switch cutting fuel in an accident, all probably good stuff, but why not have an idiot light for fuel pump, and oil pressure, since they have a different lamp for the brakes?
No, due to the instantaneous way it cut out I thought it may be electrical but checked the fuel pressure first by pressing the pin in the Schrader valve. A high pressure squirt of fuel came to so I then checked the inertia switch, cambelt and then the plugs which had no spark. At that point I called the recovery which took 5 weeks to get the car back to the UK from France.
I suspect that low fuel pressure would trigger the check engine light but as my engine had cut out the orange light was on anyway. It may be feasible to install a separate fuel pressure warning light but although it seems a common issue if you look at the failures per 1,000 miles it's really quite low.
In many ways it's the same as the regulator - it's likely to fail sometime and there's a known upgrade so do you wait (and maybe carry the spares) or proactively change the units when convenient.