Here is my Reiki 1 & Self Healing Manual that you can download free (3.4Mb). It has been constantly updated over the past few years and has much of this website content in it.
Various groups have been working together to take forward the issue of voluntary self regulation of Reiki healing and teaching. This is to create some kind of national standards for Reiki practices so that clients can be assured of a quality standard from Reiki healers. Voluntary self regulation could pre-empt mandatory government regulation through an act of parliament.
One of the main Reiki groups, the The UK Reiki Federation has been working with the Natural Healthcare Council, a part of the Prince's Foundation for Integrated Health through the Reiki Regulatory Working Group. National Occupational Standards for Reiki have been finalised and agreed with Skills for Health and are available to view here. Anyone can give feedback and make comments about the standards.