Richard,
Firstly wlecome to Rotorheads and let me offer my condolences on the loss of your brother in such tragic circumstances. Unfortunately I am not familiar with this accident, so I can offer no help in this aspect, however as I fly a similar type of helicopter for a living, I would also be interested to hear the details made public so that lessons may be learned to help avoid similar accidents. I am sure someone on pprune will have some more useful information for you, and hopefully the authorities will pull the finger out and publish the accident report in the near future.
Regards,
BC