During today's ceremony, historian Ian Acton read a dedication to Captain Scott and four other members of the Antarctic expedition who died on the trek.
One of the men was Gower-born Edgar Evans.
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Fire crews have been responding to reports of flash flooding in Carmarthenshire. Some homes have been affected.
Medication designed for animals was taken from the building in Abertillery on Thursday night.
More than a thousand riders will be taking part in a series of events in and around the town.