Found!

A month to the day that my ring mysteriously disappeared it has been found - it was in the innards of the washing machine. My cleaning lady had the great idea to drain the machine just in case and out it swooshed in the company of an underwire and assorted other bits of metal!
It must have come off whilst I was stripping sheets off the bed the day it disappeared.
When I violently shook my hand to test if it could come off on its own it did! SlimmingWorld must have taken some fat off my fingers!
So grateful to have it back :-)