Thanks for this, I sort of knew it but it is good to see it written down. As I am away the week after I will endeavour to bring a couple of prints along on Tuesday.
----Original message----
From : [hidden email]
Date : 01/10/2015 - 12:51 (GMTDT)
To : [hidden email]
Subject : Re: Mounts
Bob, if you go to Picture This, shop in Tubbenden Lane he will help you out. You can order 40 x 50 mount and ask him to cut the aperture to whatever size you want. He supplies various mount colours too. Tell him you are in OPS then he will understand what you are after. My advice is to get 4 at a time because if you order just one it is more expensive (he gets 4 mounts per sheet usually)