Old bricks/slabs/blocks (DE24)

I'm trying to fill in na old koi pond in my garden and wondering if anyone has any old bricks, broken patio slabs or smaller concrete blocks they're looking to get rid of?

I'm happy to pick up, but would be doing so in my car so I'd have to do a few trips if it's lots, and I'm limited in terms of length of items (eg concrete posts probably wouldn't fit).

Thanks