London Mayor warns the SNP want to 'end the United Kingdom , to decapitate Britannia ' Says Scottish Nationalists want higher taxes and welfare payments . David Cameron warns England , Wales and Northern Ireland would suffer . Nicola Sturgeon launches manifesto with vow to 'lead ' Britain .
London Mayor warns the SNP want to 'end Britain , to decapitate Britannia ' Says Scottish Nationalists want higher taxes and welfare payments . David Cameron warns England , Wales and Northern Ireland would suffer . Nicola Sturgeon launches manifesto with vow to 'lead ' the United Kingdom .