Be careful what you wish for. The previous anon who messaged me got pregnant. May want to take a test, just to be sure ;)
Alden are sized in US sizing as opposed to C&J which is in UK. The general rule is that your US size is one whole size larger than your UK size, e.g. I wear a 10 US, but 9UK. Width is also measured differently, the standard C&J width is marked ‘E’ but this translates to an American ‘D’. This is further complicated by the fact that Alden lasts fit differently. For a good explanation of this, check this in my Archives
The best way to know your US size is to get your foot length and width properly measured on a Brannock device that measures your US size.
Thanks for the question and I hope this helps!