I have a diesel, Alex - I'm aware it combusts. (and roughly how, enough so when someone starts going on about how it sounds like a tractor I can bore them with details).
When I say burning I mean if you were to take a match to the fuel source...combust is exactly what it means, the awesome bit during a combustion cycle. While technically yes burning is combusting I very much doubt that London Combusting would have been quite as effective as a title.
It's not like petrol (vapour) in which if you have a pot of freshly poured diesel and freshly poured petrol and you hold a flame to each, the diesel will not catch. I know, I've tried. :sadbanana Much to the disappointment of my friends who wanted to see me catch fire. On a summers day in 35 degree of direct sunlight in a black diesel can, I would presume it was near enough 60 degrees inside and it showed no sign of lighting up! Unfortunately as I said..
Diesel fuel requires compression to combust in a car, now I'm not a scientist and I can't be bothered to be, but from reading online the combustion temps in a diesel engine cylinder are more like 350 degrees which is above the autoignition point of diesel which is like 210..
I've heard of probably 5 or 6 people with the injector failures and not one reported smoke from the front of the vehicle or even any fire. Just a load of beeps and dash lights and an engine that won't run or idle.
Now I am not saying it's impossible for that to happen but there would have to be serious complications beyond failing injectors. Most likely electrics related to the injection system melting and catching fire (hey it's a VW it happens). And IF it goes it will 99.99% not be an explosive fire, as in BOOM everyone dead.
Although if it is please let me know so I can salvage some parts.