Normally the chimney will only be about 100mm in dia so easier to route.
Thanks Cat - Iāve got my eye on the red one! Just found that we have a distributer only 20 minutes away. 
Thanks @Corona - my concern is that our extension (one storey) will be built on the side of our two story cottage and I canāt quite visualise how the chimney can extend up beyond the roof of the extension so that it reaches above the height of the main roof. I think it will look very strange and ugly, not to mention a challenge to fix.
It seems many pellet stoves can vent at a lower level and donāt need to go all the way to the roof. You may find that will be the case with this one.
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If the flue can be brought to an outside wall then you can have a low level balanced flue outlet. The restrictions for the position of such a thing have already been posted earlier in this thread by @PeterE
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