NEW : Police respond to trouble by small groups of masked protesters . Chancellor George Osborne said last month though that the economy was `` healing , '' and that the government 's strategy was delivering results `` despite strong headwinds . '' Large numbers join union-backed marches in London , London and Belfast . People `` want a Britain that works for them , '' says Cameron leader David Cameron . Labour Party 's government says `` painful decisions '' are necessary to get Belfast back on track .
NEW : Police respond to trouble by small groups of masked protesters . Large numbers join union-backed marches in London , London and Belfast . People `` want a Britain that works for them , '' says Cameron leader David Cameron . Labour Party 's government says `` painful decisions '' are necessary to get Belfast back on track .