It seems to me that all minority identities inevitably turns to resentment to the greater other. Depending on circumstance and state policy it may be encouraged to the point where it becomes monstrous and lends itself to allyship with enemies from the farthest of fields.
Ideas of Welsh, Cornish, Irish or Scottish identities separate from a greater English nation and its essential components have but one goal and it is the physical dismemberment of our nation and to then turn the butchered gore of a formerly power polity into bases of operations for whatever enemy our nations has.
All these people are primarily English speakers and genetically identical to the typical Englishmen, they are a part of the English nation and should be seen as essential to a necessary English project, that being what our collective national will strives towards, a greater expanded physical-England. Their pre-English traditions can only exist as entirely local, separate from any oppositional whole such as Wales or Scotland, and be resigned to their small locality to add to the overall cultural uniqueness of a greater England.
Scotland, Wales and Ireland must be abolished, in their place you will have Ayrshire, Lothian, Glamorgan, Gwent, Ulster and Cork. All a part of an expansive nation and eternal destiny they were denied before.