The job was not without it's issues but thankfully I appear to have a level concrete slab. The men scratched around my garden and used an old fence post, old bricks and bits to construct a ropey looking frame. When I was called to say the job was finished I had to ask for one of the sagging corners to be dealt with and then supply some ply wood to help support the cement. Not a professional approach. The workers response was that he received his instructions via a text message and hadn't seen the photos I had made available, so didn't come prepared. Perhaps some lessons learnt here for the company. They cleared up after themselves and were pleasant enough though.