At last I have something I am happy (ish) with.
This time I glued a large spigot to the base of the blank. When turning the inside I made sure I undercut the rim slightly so I could reverse chuck in the jaws
A large rubber band provided protection
And now a bowl with a nice flat bottom
Just have to work on re-centering when reverse chucking. Oh and make a couple more
Thanks to those who helped on t'other thread. Practice and trail and error helps no end.