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If you are using Indian Sand stone(not ideal for a drive tho), I would first lay a reinforced wet mix concrete base, 100mm on 50-75mm hardcore, depending on ground. The slabs would then be wet laid on a full bed(not spots) of 6/1 sand/cement, pointed with 4/1 soft sand/cement or pointing mix. Do not use a 'dry mix'.
I agree with what Colin advises plus you need to brush a slurry the rear side of each flag using neat cement and SBR mixture to form a bond bridge
Damn, forgot the SBR - but it was silly o'clock when I posted my answer!
Also a few other things to consider with it being a driveway
-Opt for a darker stone to minimise tyre marks and oil stains
-Choose a hard stone thats fit for the purpose
-Consider sealing it to prevent oil and grim absorbing deep into the stone
-Check the thickness with your supplier. There is some very thin stuff available in the UK, I have seen companies selling stuff as little as 15mm thick. Not suitable for a driveway.
Cheers, Steve
Pavestone sells a 40mm thick designed for the driveway Indian Sandstone Paving. See Paving Expert Website www.pavingexpert.com/flags_driveways01.htm
Darkish colour too so no tyre mark problems.
What about a concrete printed drive?
Choice of colours and a lot more robust