Googling suggests it may be the engine management system, possibly running too rich or coil problem. I've advised the driver to call the AA (she's a member) as engine damage may be in store (harm the cat or some such?), or if she can't be bothered (likely), drive the 200 miles home at a casual rate and I'll have a look.
Not that I can do much, but I've got an OBD reader.
About right?