I am one of the IT professionals Dr. Durtnall (see Doctors and specialists in the UK, London) alludes to treating in his statements. I found his clinic via coccyx.org after another physio had been unable to even properly diagnose me - many thanks for this resource.
Many years of poor seating and posture had resulted in several calcified joints and significant pain - however Dr. Durtnall's treatment massively reduced it after only a couple of sessions. I would also like to remark on his attention to detail - he took whole-spine x-rays and was able to additionally diagnose a hip-asymmetry problem I never knew I had. I highly recommend anyone developing coccyx pain to go straight to this expert.