Not too sure on this one Spam, dont think it Sweet Chestnut though it would have really distinctive growth rings, looking at the growth rings in your pics it appears to be a fast growing tree because of the spacing between the rings, dont think its Pine, not too sure about it being Lime, although the bark is similar, if its a hard wood to carve it rules out quite a few woods, even when seasoned some woods will be really hard to carve, I.E Oak, Ash, Cherry. Its a tricky one fella but I'm going to say Ash?.
Simon.
Simon.