I believe the subject of Wales going for independence would be complicated by the fact that she is a Principality as opposed to a Country.
They could restore Offa's Dyke to keep out the Welsh (almost follows actual border). The extent of Mercia during the Mercian Supremacy, showing the line of Offa's Dyke (red) please log in to view this image Schematic cross-section of Offa's Dyke, showing how it was designed to protect Mercia against attacks/raids from Powys. please log in to view this image Offa's Dyke near Presteigne, Powys please log in to view this image http://en.wikipedia.org/wiki/Offa's_Dyke
