In reply to TobyA:
Hi Toby
I have the winter road boots and also summer road shoes. They are both a size 42 of which I am in most other shoe/boot trainer etc.
The winter road boots I have are slightly bigger than the summer road shoe. Possibly so it can accomodate thicker socks.
I don't have particulary skinny feet and they are comfortable.
The draw string velcro to do them up, isn't the best in all fairness, but I have had no problem with wet feet when wearing them in rain.
I would probably opt for a two pairs of socks when its really cold, one being a thinner pair then a thicker over that.
If you want any more info just post and I will have a look at measure when I get home if you think that may help?
Mine were last years too.
As a contrast I also have DHB MTB boots in a 42 and the northwave are slightly more roomy. I also have some specialized carbon and they are sized small!!