Flag of the Scotland Socialist Republican Front, classified as a Terrorist organization internationally, and use of the flag is banned in Britain.
Banner of the Scottish division of the Pan-Celtic army. A paramilitary organization using terror tactics in Scotland, pretty much everywhere else it is a political party advocating for a union of the Six Celtic nations. Use of this flag is banned in Great Britain, but it is often used at protests against the war in Scotland.
Flag of the Scottish Republican Army. Of all the factions, this is the one that has come the closest to creating a independent government, and has gained popular support by providing basic services that the British forces cannot. Use of this flag is banned by the British, but it is used internationally to show solidarity with the Scottish insurgents.