Welcome Jack,
It's perfectly alright to post here. Sorry about your cousin, I hope that the inquest, and other information will bring closure for you. Though I myself have no details about this accident, in time, the AAIB report will be made public, and it will be your best source of information. This could take more than a year. In the mean time, other posters here may point you in the direction of more detail on this sad event.