Around 30 firefighters are still tackling yesterday's blaze at an industrial estate in the Vale of Glamorgan. The location of the fire at Llandow is different from the blaze at a Recycling Centre earlier this month. It could last for days.
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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.