You might also get help here:
http://www.kenyasociety.org/ . The Kenya Society will by now have very few people who remember the events of Mau Mau, but there may be someone who can help. They don't have any records or archives.
For people with Kenya connections, particularly for any who are now living in or near London, I would recommend the Society as a good way of keeping in touch. It has good support from the High Commissioner and often has good speakers.
