Gorgeous coat! I had the sleeves shortened on a Pure coat recently and they did it from the shoulder as the detail on the cuffs was, err, so detailed! It cost £18 and you would never know it had been altered. Brilliant job by my local Polish tailor.
Ring the store and ask them...? If they can't help, I would take it to a tailor rather than a high street basic alterations service - somewhere that makes bespoke suits etc. They will be able to alter it and retain any detail.
Just got my my-wardrobe order this morning and the Burberry peacoat that I ordered is beautiful, but the sleeves are waaay too long. Not sure what to do.... would the Burberry store in London be able to shorten them (at a cost of course!) for me even though I didn't buy it directly from them?
The sleeves have some detail on them so don't feel confortable taking them to just any seamstress..