I found one on Amazon.com.uk: (and it has free shipping!)
http://www.amazon.co.uk/Salter-9175-...077929&sr=8-38
It says capacity of 31st/6...maybe it's something you could use later? Or maybe the company operates in the UK somewhere and makes a higher capacity one? I know some of the Weight Watcher scales in the US are high enough capacity that I was able to use them at over 400 pounds.
Good Luck!
-Mike