A rally will be held outside the Senedd today following the Chancellor George Osborne's spending review announcement yesterday.
Cardiff Trades Council will be supporting the PCS union in protest to continued job and spending cuts.
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The Welsh Conservatives say the Swansea project should go ahead despite indications the UK Government may be about to turn it down.
Road closures are in place until 3pm today as the Cardiff Triathlon gets underway in Cardiff Bay.
It is going to stay fine and dry through the night with light winds.