Hi guys, I removed the plasterboard covering my fireplace and underneath was no subfloor and just a wooden beam under the bricks. So back in 1985, the flat downstairs removed their chimney and shored ours up with this beam. I assume it will cost a fortune to rectify. I.e structural engineers etc. What is the best way to proceed. Insurance? I can't find planning for it other than the plans to convert the flats and I can't see the removal of chimney on there. Or should I just board it back up and pray!