Once again I have to say that the answer as given above by Ethel is spot on. (Obviously has had some experience in these vexed matters !!!)
The fact remains however that for the sake of some relatively small outlay, but voluminous paperwork, you would quite easily obtain a court order, which eventually empowers bailiffs to act to recover the debt on your behalf, but it is then that the cost to you becomes great and you have to weigh up all the pros and cons as to whether it is worthwhile. I hope you do have some luck, but it will be achieved more by bluffing than by positive action.