About the south east/midlands bias: who in England, Wales, Northern Ireland or, indeed, the Continent or the States would buy a book about "Austerity Scotland"? Hardly anyone, I gather. Would the hardships of people in Aberdeen, their hopes and beliefs have been radically different from those of most Londoners? Probably not. You will have to come to terms with the fact that the centre of politics, the economy, cultural life etc. etc. is in the Southeast of Britain, not in Wales or Scotland. (A book called "Austerity France" would inevitably have centred around Paris, a book called "Austerity Austria" around Vienna.)
And although historian Norman Davies has gone out of his way to explain that "England" and "Britain" are not the same thing, abroad (and probably increasingly so in Britain / England itself) the names "Britain" and "England" are generally used indiscriminately to indicate the same geographical area.