Peter; was spontaneous combustion more common then?
Dickens got a lot of it right over Krook in Bleak house.
https://www.mentalfloss.com/article/564288/charles-dickens-bleak-house-spontaneous-combustion-death
mental floss says it was 100y before BUT others say there was a contemporary case
Dupuytren ( 1830) - he asked ! atheist asked!
suggest the real sequence of events
and.... you need a dead person, an external wick ( Dupuytren realised clothes wd do) , an external fire source ( candle and or fire) and....a closed room with low oxygen
( so it is a slow burn, O2 less than 21%, and the incomplete products of combustion gloop around the walls) VERY well described by Dicko
so more common - - - well er - more people ( 6 bn in the world) so more cases poss. is anyone counting?