Yes, as long as you have been growing that plant it can be shown and judged
I think you have hybrid name and clonal names mixed up.
If you remake a cross from 1919, it takes the name hybrid name. For example all Paph Honey will be Paph philippinense crossed with Paph primulinum. These hybrid name will have to be registered by the Royal Horticultual Society eventually.
But you can give any clonal name you want, and these don't need any formal registration. These are the names you have inside the ' '. For example Paph Honey 'Djarum Black'