http://www.bbc.co.uk/news/uk-18177069
Knowing, as we think we might, that there are some chaps out there who enjoy a bit of extreme onanism; names such as David Carradine, Michael Hutchence and Kritisan Digby have been mooted; and as such I can sort of understand the 'Wank in a bag' theory around the MI6 fellow's demise. The pathologist in this article is trying to point the investigation away from the idea of nefarious 3rd party involvement, as was found at the original inquest, back towards an act of holdall hand solo.
However, even if he was enjoying a haversack handjob, why would he need to lock the bag?
Smells oddly fishy to me.