Thanks for checking this out - I'm glad to have brought this to your attention and relieved I was doing things properly.
After playing around with it for a while, I can see that Inset is nice to have in the MoI toolbox, I can see me using it quite a lot.

Is there any reason that a zero value entered into the 'Thickness' property couldn't be made to work - I'm thinking that it might be a way of offsetting an entire surface by the amount entered into the 'Use separate height' property?


Martin.