The first thing to appreciate here is that mediation is not a formally regulated profession. There is no single regulatory body that you must be registered or certified with in order to legally practice as a mediator. So technically, your cat can call itself a mediator, and it would not be entirely wrong!
However, the lack of formal regulation meant that the industry had to organically develop ways to regulate and maintain standards for training and service provision. As a result, some organisations have established themselves as authorities in the field of mediation by providing a quasi-regulatory framework for mediators who voluntarily choose to associate with them. So, although you don’t technically need any training, to have real credibility as a mediator, you will want to train in accordance with the requirements of these bodies and be “certified” or “accredited” by them.
In England and Wales, the main authority in the field of mediation is the Civil Mediation Council (CMC). It is the first point of contact for the Government, the judiciary, the legal profession and industry on mediation issues. As a result, you will want to attend a course which is approved by the Civil Mediation Council. Consequently, upon successful completion of the course, you will be able to register with the CMC and have their stamp of approval in the market.
Other mediation bodies include the International Mediation Institute (IMI) and the Chartered Institute of Arbitrators (CIArb.)