Most would go for the suicide/accident theory until reading that the body was in a PADLOCKED gym bag. Those Brits are so stupid when it comes to the obvious.
Since the beginning of the golden age of British rail in the 1830s, there have been bodies/pieces thereof turning up in unclaimed luggage at railway stations.
The British referred to them as "trunk-murders".
During one such spate in the 1930s, a popular seaside holiday destination earned the moniker "Torso City" for hosting three of five unclaimed luggage-containing-remains incidents.
Apparently, Bill Clinton's Arkansas ME has emigrated to the UK to continue his work avoiding whenever possible, ruling suspicious deaths and obvious professional hits, murder.
If it really was an accident, the British would have used the "Death by Misadventure" term as the cause.