For that size area I would advise two bulk bags of scalpings/sub-base MOT/mill waste, or whatever it is called in your area.

A local builder's merchant will know what it is called in your area or you could get it from the likes of B&Q where it is called sub-base MOT.

Level this out and then use a wacker plate on it. You can hire them for a few pounds for half a day from most hire places. Go over it several times and get it back within 4 hours for the best price. Check with the place that they will do this four hour hire. If you are just a few minutes late they often try to charge more!

The correct order is the soil, membrane, scalpings/sub-base MOT/mill waste, gravel grid, gravel.

Try to get the scalpings/sub-base MOT/mill waste and gravel as close to the location as possible, it's heavy stuff and not something to try to rush. Expect a bag to take an hour each to empty, move and put where you want it.

Stay hydrated and fed, it's hard work if you are not used to it!

Hello.
If you want a good job, then it's advisable to put in a sub-base, recycled hard core will do the job you will need and at around £10 a ton the cheper option, mot type 1 is the best sub-base you will get but a little more money, invest in a ton and that will cover your area, working on the basis its little over 10m2,compact this with a waker as on a new build the ground can be fairly unstable, after this process use a permeable tec membrane, this will allow water to shift through the sub-base more efficiently, don't put the membrane under the sub-base, you will get weeds!!!! After that a ton and half of gravel will do to cover your area, hope this info goes some way to help, all the best team rs paving and landscaping (Ben).

Be smart lawns to do it this is natural problem for us we do this all the time

Hi as the soil/turf has been removed and the ground underneath is fairly compacted ir should be fine to just put a membrane down and fill with gravel.