CEDR have a video for sale. Mediation is a professional activity that should attract CIMA Members in Practice. Be warned, the training is essential and has to be paid for. There is no guarantee of work coming forward and the pay back period must be taken to be about ten years. The training for mediators is by lectures and role playing.
Opportunities also exist for pupillage while someone else does the mediating.
Expect to meet lawyers in the process. The probable effect of a court judgment has an important influence on the parties reaching agreement. The agreement needs to be legally sound as it would be a disaster to have a dispute arising from it. The qualities required of a mediator are only possessed by rare paragons so ordinary people can undertake the training as well. Listening ability, wide business experience and imagination are all plus points.