Update on previous update!
So the more I thought about it... the more it seemed unlikely that my 2003 (old girl) needs a software update.
So, I rang my local Renault dealer (Masters at Shirley, Croydon).
I got their phone number from the net and it was different
from the one the motor factors bloke gave me!! (hmm, smelling a rat here!?)
I asked the man at Renault's if my car needed this software update. He said no .. not on an 8 yr old car.
He was honest (if that's the right word) to say that nothing would show on a diagnostic,
but that we could leave it with them overnight for them to see the cold start in person.
Back to plan A . . . temp sensor, glow plugs & battery!