Get a lasso around that old stack, stand well back and pull hard..... umm maybe not in this situation... there would probably be a lot of tiles n more to replace.That's what I was thinking changing the Aav,s a simple process plus I'm going to the trouble of concealing the soil pipe ( purely aesthetics) my existing Soil pipe is an old cast iron which I've away hated looks crap
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I've pulled one down with a rope, a lot of years ago, it was a straight CI stack... the property was empty (no people in) it made a lovely sound when it hit the ground..... crack..crunch 🙂