Chasing out breeze block
It is a 9in aerated dwarf conservatory wall
i.e. 215mm wide block, or a cavity 100mm + 100mm or such like?
In any case, aerated is pretty simple. You could gauge it out with your
fingernails!
If dust is not a problem, then use an angle grider. Otherwise, you might get
away with an old tenon or floorboard saw.
Christian.
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