Hi Kate
I am going to agree AND disagree with AK on this one!
Not least for political reasons it suits HSE to have underreporting of RIDDOR incidents.
So, they probably don't want to know about this particular scenario and are certainly very unlikely to kick up a fuss if they were to find out without being told.
But, HSE's views, its guidance on RIDDOR do not change the law of the land.
On the assumption that the sepsis is related to the burn (which is a reasonable assumption based on the narrative you have given), then as Pirelli says, if the burn hadn't happened, the sepsis would not have followed.
So, in my eyes you have a clear cause and effect line.
Minor accident occurs, minor injury results, injury is exacerbated and you meet one of the thresholds for reporting under RIDDOR.
Hence, my view is that this is reportable.
As AK says RIDDOR is not about liability but about collating statistics using criteria set out in legislation. If the HSE doesn't like that legislation it is much better placed to get it amended than you or I.
When I worked for HSE I had a somewhat similar case which ended up with a dead body.
- joiner (or carpenter to some) working in flat being renovated fell a maximum of 340mm where a floor board had been necessarily removed. So, he twisted his ankle. Then that injury was exacerbated when he stumbled on the edge of the pavement in the street. Then he ended up in hospital, an embolism followed and he died. The general consensus was that there was no convinceing argument to say that the embolism would not have happened if the joiner hadn't taken the initial fall.
In contrast when the painter fell 1.5m off a trestle scaffold, nobody had a firm opinion as to whether the heart attack which resulted in his death had occurred before he fell or as a consequence of the fall. We added it to the fatality statistics anyway.
P