In reply to pad01:
Hanwag sizing in length is pretty much true to size, I have worn a lot of them (I work in a store where we stock pretty much exclusively Hanwag boots). I am a size UK 8,5/EU42,5 across the board. Be aware that they do a lot of different widths so sometimes it's comparing apples to oranges.
For what it's worth, I use a Hanwag B2 boot called the Friction GTX, I am a size 8,5 in those and they comfortably fit with a wide range of sock thicknesses. I also own a pair of Scarpa B3 boots (I think they're called the Ortles GTX, discontinued a couple of years ago) and I also have these in 8,5. They are a tiny bit shorter than the Hanwag, and also a tiny bit narrower, but I can still wear them comfortably with normal hiking socks. If I would purchase Scarpa again I might go one half UK size up though.
My feet are slightly above average width but not by that much that I would need a Wide Hanwag last.