Sounds more effective than my ‘learned’ mate who reckoned lpg from his bbq bottles was the way to go. After filling the Warren with gas and igniting with an almighty whooooomph! the earth moved skywards. He spat turf before exclaiming ‘got the b#stards’ but had to reset a couple of fence posts due to the soil being shattered. The explosion reminded me of WW1 footage showing explosions after tunnellers dug under the enemy.
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