You could reset it by disconnecting your battery for at least half an hour. That should lost everything then. Only problem with that is that if you go to an MOT station without doing an urban cycle (about 25 miles of general driving) it may be running like a bag of nails!
Try it before your MOT and see how long the light stays away

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Quote Clarkson, Top Gear, 17th July: "I'm not having a stroke... just driving a Nissan!"
Quote Ry, Mallory Park, 3rd Dec:
"Ahhhh crap... Just a bit too over eager really!""I used to be an adventurer like you, but then I took an arrow in the knee"