no scanner needed, just a search on SCN, or failing that look in the owners handbook.
think its:
turn ignition OFF,
press and hold trip reset button,
switch ON ignition,
release trip rest button,
turn trip button clockwise until it goes out.
igniton OFF,
Igniton ON.
Well I'll not be taking mine to them; they replaced all of her pads and discs on a 40,000 mile old 1.4

Ha ha, probably. It's not just the changing that bothered me, it's the fact that they did so without her consent and it cost her a fortune. Then when I queried it with her she said "well they said they needed doing, so they were done". Yep, saw her coming!
The garage still remains the legal owner of those parts wether the go ahead was given or not.