One thing to bear in mind with Salomon is that their base sizing is using the Mondo sizing – ie the Salomons I own are a 26. That sizing appears to be pretty accurate compared to other things I have, but their translation from this to UK sizing (and Euro) is a little strange – that 26 translates to UK 7.5, US 8, EU 41 1/3!! That’s when I’d normally take a UK 7, EU 41 (US 8 – hence their translation between UK and US is off).
I should point out this is with an XC ski boot, the only recent Salomon I’ve bought, so walking boots may be a little different.