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Yeah you should use vpower! Renault have no fiancial gain by asking you to use it so if they say use it, use it! As with your light coming on, i found mine to be an upflow oxygen sensor and a decat.
Your car will pass an mot with the light on as long as the emissions are low enough, and i'd replace the lamda sensor i got one out of TMS Motor spares for £53inc vat. shifter or spanner and pull the plug apart should be sorted