Quite snug, but not more snug than other shoes I own in UK width F from Grenson for instance. The main issue is the lacing area strangely enough. I have a derby on the same last which is also a snug fit sans the lacing issue.
Bought the CT blue suede chukkas and they are on the Loake 026 last (Loake Kempton rebrand).
Here is a picture of my Loake Pimlico (8F), Loake Kempton (8.5F) and the CT Harwood (8.5F). As you can see the 026 last is quite short compared to the Capital last.