Thousands of protesters today called for the Government to axe the changes to housing benefits, dubbed a "bedroom tax" by campaigners.
Organisers said some 12,000 to 13,000 activists had turned out to protest across the UK against the plans, which will see benefit cuts for people with a spare room.
The protest's national organiser, Dr Eoin Clarke, said:
It punishes the disabled, single parents, carers, the terminally ill, soldiers serving on the frontline and foster parents with more than one foster child.
It is not about left and right, it is about right and wrong.
David Cameron's Government have shown that they just haven't got a clue.
The biggest marches took place in Liverpool and Manchester, with more expected in London, Edinburgh, Glasgow and Cardiff on March 30.
More top news
Theresa May's bid to become Tory leader has won the backing of senior cabinet ministers including Michael Fallon and Patrick McLoughlin.
A 19-year-old has officially become the UK's youngest airline pilot after fast-tracking his way to a seat in the cockpit.
Twenty years ago, long before today's centenary events, surviving veterans made their own pilgrimage to the site of the Battle of the Somme.