A couple of years ago we tookout a hideous and useless gas fire and replaced it with a beautiful stone fire surround, hearth stones and a gas fire with 'individual' coals,. This looks lovely but chucks out very little heat. Would it be a simple matter to take this out, seal off the gas pipe and install a coal/wood grate? The chimney is a proper one (c1953) without any lining, and it draws well. There is an iron back plate at the back of the fire. Can anyone advise me?