To complete this story...
We are now post-ticket submission / completion, with all requested changes complete and our live store upgraded to 5.2.13 from 5.2.10 but without featuring any of the "...post big night out visual effects" on the menus, detailed previously when testing this in our Dev store.
This death of Extended Simple CMS module made the 5.2.10 to 5.2.13 upgrade a long winded one for us. Other sites may be different than ours, but the method of "....simulate everything in your Dev store first... Or buy a defibrillator..." is now etched on our desks
