Tradesman agreed to do some work, took £70 in part payment of work/for materials etc. Then he didn't turn up as agreed on 2 separate times. I told him to return money. He acknowledge he owes me the money, but says he'll return it 'when he is ready' 
Obviously I would like my money back straight away. What can I do?
I have his name and address.
Please help, financially, I cannot afford to let it go.