I serviced mine myself last time round as it's a high miler - but for you it rather depends on your mileage and warranty details.
Certain service intervals 72k miles i think required the timing belt to be replaced which is a dealer only job as your need a special engine support tool which spans the engine bay.
I presume your late 2002 car still has a little bit of Renaults 3 year warranty left ?
I any case it would be nice if we could build up a list of garages in the uk to help members.. What does everyone think ?
Maybe a list of garages per area shown on a map with comments from members ?