I saw a product in the garden centre the other day, that promised effective stump removal. You drill holes in the stump, pour in this chemical, drench the ensemble with paraffin, and set fire to it all. The stumps are then supposed to turn to ashes over the next couple of days. Since I want to remove the stumps and also enjoy setting fire to things, there was nothing not to like. Did it work? Judge for yourself. These pics show two different stumps after the treatment.
The second one is a bit better cooked that the first one that is hardly touched but it was sell rotted beforehand. They still represent a hazard to dreamy mowers. If I was a politician I could call it a partial success. I suppose the torrential thunderstorm didn't help.