Loake shoes are sized in UK sizing, meaning that most US customers will size down one full size (so a US9 = UK8). The Capital last is generally described as a slightly roomy true to UK size. From the Loake website:

"We find that the majority of customers find that their regular UK size is quite adequate in the Capital last and is thought of as quite true to size for those with what is considered to be an average width foot. Some may find that there is just a tiny bit of extra width and length but this is minimal and not worthy of adjusting your size for unless you have particularly narrow feet."