Simple answer. No. Especially if sold by dealership. If you want it, go direct to the insurance company and cut out the middleman. You will not believe the difference in price.
Got a quote of 69 quid a few months ago when my wife bought her 108, we did not bother. It was a RTI policy, and 99 quid for CVR policy. The dealers policy will probably be the cheaper one. My brother got suckered in by the dealer, but he cancelled and got it for one third of the cost, and a better policy.