Aidan, at one time these notes were right common. So much so that they were sold as novelties in Chemists shops for 45p in the early 1970's. Actually the inscription you have noticed means "cancelled", they were forced by the authorities to stop the note issues, so as a result they did this to further inflame their cause. But alas, these notes subsequently got scarce, the notes I could pick up as inexpensive novelties became scarce collectors items by the late 1990's, perhaps it was the realisation that these were relics from a more radical era in the devolution cycle in Britain that were overlooked as collectibles. So that now when in the instance you find them for sale, they are right pricey. I had all the bridge notes, the cog railway notes, the castle notes etc at one time, my brother wanted them so I gave all but a castle 5/- to him. Now I wisht I had them again, who knows what he did with them.