Thank you Mr Hobbs!

...for the Focus Stacking lesson...
Your instructions were immaculate: Elements+ did as it should on the download, my copy of Elements 13 accepted the update and the process was easy to complete. Now all I need is a better collage generating programme - and suggestions anyone?
I kept things simple, using only one focus point on each duck, and then combining three images. No editing done, not even a trim of the edges on the merged image, but I think the process shows up OK via the four images in the collage, even though the orange duck is a bit out of focus in the final one.
Always nice to learn something new... and something to be said for a spot of rain when it gives you a chunk of time to practise...