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meetings on Wednesday have been abandoned following a forecast of extreme heat in parts of the UK.
The Met Office has issued a rare red warning from 09:00 BST on Wednesday to 21:00 Thursday for parts of England and Wales, with temperatures possibly reaching 38 or 39C.
The British Horseracing Authority's hot weather policy states that where racecourses fall within a red warning zone, the fixture will be abandoned.
In addition, horses must not be transported from or through areas that have red warnings in place.
Worcester's National Hunt fixture and the Flat meetings at Salisbury and Kempton are all in the affected zone and while Ffos Las, which was also due to host a jumps card, is just outside, it would require participants to travel through the high-risk area to reach the course.
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Just when i was enjoying the evening races and getting my profitable Mojo on and made my Ladder look pretty
