Well Cornwall -Kernow if you prefer - like the Isle of Man, has always been part of the 'Celtic fringe'. While the Cornish language dropped out of community use in the 18th Century, it underwent a revival in the 20th and now has at least 500 fluent speakers - it's recognised as a regional language by the UK and EU. You can see traces of it in place names and surnames ("By Tre-, Pol- and Pen-, ye shall know the Cornishmen").

As to borders for Birmingham, fair dos, as long as they all stay inside them! I don't know about you, but I could really do without hearing "Yow aw-roight, then?" again!