I'm in the process of removing an old fireplace and having stripped everything away I'm left with the original fireback/insert and the fire grate (which appear inseperable). It seems to be fixed in with concrete around the top but there are gaps at either side. Can anyone tell me the best way to remove the fire insert? Is it okay to just take a power tool to it to get it out? I'm a bit concerned that the fireplace may be taking the weight of any brickwork above. Also, the fireplace used to heat the back boiler which in turn heated the radiators throughout. The system has now been drained but I want to get rid of the back boiler. How do I do this? Any help is much appreciated. I really want to get the hole in the wall patched up before the Scottish winter descends.