I thought I would have another go at inches, and if they worked out O.K. I would join a swap.
I should have check the site for details first - but by this time I was in my studio and couldn't be bothered to face the rain to come indoors to find out.
When I did, these were totally wrong. The theme is vintage-and these are vintage stamps - but they don't really fit the criteria and there should be nine and not six.
So off I went to try again.