Old Concrete Slabs under MOT Type 1 Hardcore

Hi All,

I am laying a gravel driveway and planning to to lay 100mm MOT Type one as a sub-base. I have a few “Hefty” old concrete slabs left over from the old driveway.

Can I essentially bury under the slabs the 100mm of MOT Type One? Will this cause issues later on I.e sinking (not that it matters as it’s gravel, i can top it up?).

Thanks in advance! Dan