Have you read the hand book with regards to start stop? It will only work when: The car is up to operating temp, All occupants have their seat belts on The aircon is not on The ambient outside temperature is above 5* iirc The clutch pedal isn't depressed Daz, as soon as you depress the clutch the engine begins to start and by the time you've selected gear it's running so effectively you have power as soon as you hit the loud pedal