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If they've gone nowhere in 100 years they're not about to, go straight over the top! What you could do is remove a couple of lines of cobbles where the shuttering will go and go 3" deep over the remaining cobbles with your concrete. Unless you are storing elephants, 3" of concrete over a solid base would be plenty.
ColinTheBald
Sam_w
Excellent advice!
I have a concreting question myself... I am putting a pad down, again the standard 4 inches. It's going where there is an old but knackered cobble path, which leaves me 2 choices for sub base, rip up the cobbles and fill with scalpings (will probably take a lot as the cobbles are prob 6 inhces deep in places) or just lay straight on top of the cobbles (which have been down for 10o years or so)...
Thoughts?