Aco Ground Guard.
A permeable solution for driveways (Click on picture to be taken to ebay)
If your looking at installing a driveway or base for a summer house then this could be the product for you. I have used it to do a few driveways and i love the stuff. Its easy to install, lightweight and you can get a lot of ground covered in a day. It comes in different size packs so it can work for any size project and anyone can use it as it just clicks together, now the technical bit. You do still need to prep the ground and by that i mean excavate if required, lay hardcore and compact but then this stuffs sits right on top.
You can then fill with whatever you desire, I have always used a smaller 10mm chipping, but you can mix topsoil with a bit of sand and scatter with grass seed, so a good couple options. Also whats great is that you shouldn’t need planning permission (although always check with the local planners first) because its permeable so water will drain straight through it.
I have used it on the flat and also a slight gradient and it seems to have lasted really well. One tip though is if you are using chipping to fill the guards then leave a spare couple bags close by as they will get moved around a bit, also lay an edging kerb at the start of the drive to have a nice straight line to go off and if you leave the kerb slightly raise it will prevent a lot of the stone going out over the path from the car tyres. Its also recommended on really steep sections to peg it down in sections. But to get a great looking driveway at a third of the price of a block paved or concrete drive then this is the stuff for you.