I Don't think so with a stove but maybe with an open fire. When you have a stove fitted you get a tag/certificate to say that it has been fitted in accordance with fire/building regs, if you have one of those then I can't see a problem Certainly Mrs IDP doesn't think so. If however you fit one with out the the tag/certificate you might not be covered. Also when you sell the house it will be a problem as with out the Tag/certificate you may need to put it all right.
Mini IDP is now safe around fires and she won't toast marsh mallows unless we're there.
AJ I bet Nickys won't be far off, I bet I could get in it!!!!