I have an assembly with the following manifest embedded:
Sorted!
Someone kindly pointed out to me that the '"SomeAssembly.dll"' mentioned in Dependency Walker was in fact a different dll from the one I opened in Dependency Walker! (Whoops!)
Looking at the manifest for this assembly I can see that the problem is due to the fact that Microsoft.VC80.CRT v8.0.50727.4053 is targetted, but not present on this machine. (Installed via a security update).