No size up
Uk 8,5 / Us 9,5
Your usual C&J size should fit
No need to size up, I have both the Harvard from FB & the marlow loafer in the same size which is my standard C&J sizing. Plus the Harvard is unlined and will stretch/conform to you foot.
Normally the Islay is made in "Dark Brown Scotch Grain", so unless the retailer has made something MTO the color is "Dark Brown Scotch Grain".
BUT there can be still difference between how the shoes came out of the factory (little difference in finish), and of course there's the difference originating from the different pictures.
The Vincent in suede is MTO, so indeed not widely sold!