The Public and Commercial Services Union is launching a UK wide tour to protest against planned closures of 39 regional DVLA offices.
The DVLA says motorists will get a better quicker service and taxpayers a saving of 26 million pounds.
In July, the UK Government announced plans to close 39 of the DVLA's regional offices. 1,200 jobs would be at risk due to the proposals, although 450 roles would be created at its Swansea headquarters.
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The heavy showers will ease during the first part of tonight, leaving a dry night with mist in places.
A 1950s pin-up girl from the Vale of Glamorgan has returned to the spot where she won the nation's hearts.
The band play the Liberty Stadium on Saturday night as part of their 'Everything Must Go' 20th anniversary tour.