Burning it out seems the way forward, and I've tried several times (over years), burying the thing in burning coal. Trouble is the stump doesn't really burn much as such; it just chars over, and has got quite dished on top, but there's a lot more to go. Anyway, it occurred to me that maybe I could try again this summer but first impregnate the remaining timber over a period of time (maybe honeycombing it with a drill first) to encourage it to burn properly. Anyone tried this? What would be good to use, that wouldn't just evaporate off?
I'm not after getting the whole thing out - if I just get the stump below ground level and cover it with a plant tub or something, that would be fine!
Or any other constructive ideas!?