Both themas and jeanijay have the answer, once you have obtained judgement and been awarded payment, unlike many people seem to think, the court will do nothing to obtain your payment, it is up to you. Bailiffs are quite useful but I would suggest you look at all your options.
Debt companies buy debts from each other, often at a long agreed rate based on their experience of that company and dependant on their chances of recovery, if you wanted to sell a single debt the amount you receive will depend on the chances of recovery, if you can find a willing buyer which may be your difficulty