Business leaders have criticised councillors who have approved plans for 36 houses to be built on the site of the former Milklink Processing plant in Kirkcudbright.
The chamber of commerce is objecting because they think the site should be kept for industrial purposes.
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Christian Pay's family say he was "loved by all" and had "the heart of a lion". The 18-year-old died after falling ill at the festival.
The first of seven races will begin at 5:45pm, and 76 horses are competing. The UK's top female jockey is amongst the competitors.
Thousands of people are expected to flock to Brampton to catch a glimpse of the colourful breed, which is more common in warmer climates.