We're digging out the clay soil in a problem area of our garden and to save ourselves from injury, thought it best to hire a small skip to put it in. We wonder now though, as we are laying a patio also, is is possible to reuse the clay to raise the levels of the patio at the end of the garden or is this not a good idea? We thought that as we would be putting hardcore on it anyway, it might not matter that it has clay underneath it...but we may be very wrong. Any suggestions as to whether this is acceptable or not? Thanks in advance.