Independent Police Commissioner for Wales Jan Williams told ITV News that the Independent Police Complaints Commission (IPCC) has three investigations into police forces in South Wales, South Yorkshire and Bedfordshire looking at their responses to allegations concerning Watkins.
She said the IPCC "owed" it to the wider public to determine whether Watkins could have been brought to justice sooner.
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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.