Phone your local county court office, they will send you out a info pack plus a form to fill in, you put down the debt and the customers details, you need to then send it back with a £30 cheque, they then send the customer a letter asking them to pay or face court action 30days. I am at this stage at moment, it has been easy upto now, lets see if he pays me and the extra costs which can be claimed back, hope this helps.
Kind regards Phil