My plan was to just brick up the cavity underneath (with an air brick too) and hide the protruding concrete bit with a shelf but I'm a bit worried that if I knock the ragged pile of bricks out on the left hand side of the opening the concrete piece will fall. I can't find a lintel above so as a precaution I was going to use trench props to hold while I lay the bricks below - is this overkill or is there a better way to do it?
Would really appreciate any advice on this as want to crack on with it but don't want the chimney coming down on top of me!
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