I don't think they are you know, but as they are also worth the same face value, and in sterling, I don't really see why not. They weight the same, and I've hid them in bags of UK coins and paid them into my bank account before! I do believe you can even openly pay them into some banks accounts. Also, vending machines seem to readily accept most of them! I'm not even sure if they are 'legal' in the countries of issue, because strictly speaking the Scottish/NI bank notes are not even legal in Scotland/NI, but they are overlooked. It's a funny subject that one. I think they represent a localised form of normal British currency in the country of issue, but of course no one wants them on 'the main land' purely because they are not sure what they are I suppose. I'd love it if someone could tell me the official line too. Chris