My advice for a three years or older car is avoid the renault dealers.
I own an Espace, 2.2Dci, 01 reg. 63k.
Cambelt at an indpendent up here is <£250.
I use HiQ servicing, fixed menu pricing. My bro uses the ex Halfords chain fixed price servicing.
Rear exhaust, from just behind the cat was £129 in june, again at Hi Q.
Renault dealers here re £75 hr labour and Land Rover dealers £95 hr.
The air con is about right. I always goto Kiwk fit get a tyre price, phone around the other chains and lie about the price eg drop what kwik fit say by a tenner. They always say that the have other tyres cheaper but have to order them in. Normally get one for £65-75.