Hi Steve. I think Zamberlan might be a touch smaller than the size. I have no problem with the width but I can tell that if I was walking downhill they would likely be a touch short.
The majority of my walking shoes have now evolved out to a 47 (apparently feet get flatter/longer as you get older) so my Scarpa are a EU47 and Merrell a UK12. Having said that my Clarke & M&S work shoes are UK11s.
My Daytona Travel Star are 46 and are really comfortable but I can tell the length is only just there. The Daytona 47 were just too big.
Hope that helps.