It might be worthwhile contacting your local council about their rules for burning smokeless or otherwise fuels. It would be difficult to give a good answer without details of your fireplace and chimney, but if you are in an old property that has had a normal coal fire where you are intending to have the fire then there shouldn't be a problem as long as the fireplace and chimney are of sound construction. Sometimes the products of combustion of items other than coal may be at a higher temperature than the chimney can cope with (long term that is). Cheers, Andy