A good quantity of sorted hardcore (Hanwell W7)

Massively greener than buying off the shelf scalpings etc, this crushed up concrete makes great and solid hardcore for a cast concrete anything, bases, steps, paths etc. I have used this kind of thing many times. Provides good drainage and a solid base with the addition of some smaller gravel. I have sorted it into different sizes. I also have some other pieces of concrete that need breaking up if you need more.