Thanks to all who tried to help. The liner was quite a large one so there is no problem with that. They also put a cowl on the chimney as there was not one before and the rain always came down. I am managing to have a fire as long as I do not make it too big and use very dry logs that dont smoke. It really gives out a massive amount of heat. I think perhaps the draw on the chimney is not too good so we will think about a woodburner but not this year. We have spent too much money on this already. Anyhow. Thanks once again for everyone's suggestions.