Concrete base for paving driveway

Apologies for the long post

I have a concrete drive with grass area that floods. I have dug out the grass and filled with MOT limestone. I need this to be hard standing for caravan and car. My plan is to create a series concrete slabs with small expansion gaps about 3 inches thick to level with current concrete drive. Then I will pave over total area with thin wet motar mix. New concrete slabs will cover approx 8.5 by 10 meters. Total area to be pave is about 8.5 by 14 meters.

Any issue with paving on a concrete slab and using it as hard standing/driveway?

I am also putting in a drain around driveway into a soak away.

Any advice appreciated. Especially on plan or type of paving slab to be used.

Andy

Paving slabs are not great for a driveway as the larger the unit the more prone to failure.

Also paving off a concrete base can have its problems but these are more to do with staining and efflouresence than structural problems.

If your set on flags then use 2x2' pressed concrete council type because any kind of wetcast flag is too weak so a big no no.

Ideally a 60mm thick council slab but they are a pig to work with.

Expansion gaps need only be 10mm 3'' is far too big.

Lots of advice on pavingexpert. com

Thanks for the reply, sorry wasn't clear. The 3" is the depth of concrete, expansion gap was going to be 2mill.
Am thinking initially just lay the concrete so I get a hard base that I can use as driveway, possibly add some steel mesh for stability.
Not worried about staining but don't understand why prone to failure if concrete is solid base and laying flags on motar, are you saying motar prone to failure due to weight of cars? Should I lay the flags on something else.
Have thought about bonded gravel but no idea of price. It's a large area to cover and on tight budget