woodsmith
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Looks like subsidence to me too. First thing is to check if it is still moving. You could get a 25x150mm length of glass and fix it with epoxy resin so that it spans the joint. Give it a few months to see if the glass breaks, if so it is still moving and you need to fix it, possibly by knocking the wall down and putting new footings in. If it isn't moving you could fill the gap with a non setting mastic like Sikaflex EBT.
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