Many thanks lando242 for your help.
I did not want to be up the creek without paddles as my total bookmarks must be similar to yours. Its a pity Opera do not make this clear in their features about the update. I have been a user for a great many years but despaired the way things looked after V12 as it was a severe loss of features for my way of operation. I hope the last stable release is as good as what you have in 30 as far as bookmarks are concerned as I do not know when they were reintroduced,