Welsh Labour MP Ann Clwyd says a new law is needed to help prevent the 'horrific' consequences of botched cosmetic surgery.
She believes minimum standards need to be established to protect people from unregulated 'cowboy' cosmetic surgeons.
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More than a thousand riders will be taking part in a series of events in and around the town.
Some warm spells of sunshine will develop, although scattered heavy and thundery showers are also expected during the afternoon.
A yellow 'be aware' warning has been issued by the Met Office for much of Wales.