>I think I must be doing something daft, if I change a forms width to something less that 106 it resets to 106.
>
>What do I have to set to prevent this happening?

Form's have a minimum width, for me it is 104. If you want to change it you need to set the form's MinWidth property to the minimum width you want. It si by default -1 which is what gives me the 104.