The Woolf reforms promote ADR but so does common sense. Our adversarial method of dispute resolution is lengthy and thorough. If a case proceeds to Court, you can get due process, excellent legal advice, well developed case law - and a long wait and hefty bills.
Mediation is a process to help parties to agree a way out of a problem.
It takes parties outside the adversarial system, facilitating a deal away from the costs and process imposed by the litigation system. Parties can walk away having won something, albeit by conceding something else. It sounds ideal. Mediation works when it creates an environment in which parties can settle their case. But mediation is not right in every case.