To answer some of the questions..
Its what I have left over now I have finished landscaping my garden. The hardcore is what I have left over now that I have knocked a load of stuff down/pulled it up and recycled as much hardcore as possible.
The soil is very poor quality. I have reused all the top soil and what is left is a stone-filled mix of clay, gravel and exhausted soil.
So...losing it in the garden or "keeping it for a rainy day" are not options.
I did wonder about a bobcat but I'm nto sure how this would help other than feeding my inner child
Would they have a bigger bucket than a wheelbarrow ?
Freecycle might be an option for the hardcore. I hadn't thought of that although I have given loads of stuff away on freecycle in the past.