Thanks Jason,
It is a single checkbox and I have done as you said but the check box always reverts to the default value of "checked".
The radio buttons I have not attempted yet.
I can only get it to remember the checkbox state by having the "Initial State" set to 'unchecked'
If I set the Initial State to 'checked' - which is what I want - the checkbox always returns to 'checked' when I click submit (even if it was unchecked before I clicked submit)