Can anyone tell me if the IACV is fitted on any other cars. or do i have to buy a new one from Lotus. Mine looks a little scored and i think is causing the revs to stick for a moment at 3000rpm because its not returning to its closed position.

I think it’s only fitted to the Exige S1 - maybe 190 Elises have one as well.
The bracket on mine had gone AWOL and it was causing the revs to increase when braking. Also there was loads of muck in the valve. Garage fixed valve with a few electrical ties. New bracket now in stock and waiting for next service so it can be fitted.