The A30 Eastbound is blocked between the A382 (Whiddon Down / Merrymeet Junction) and Cheriton Bishop Road (Woodleigh Junction) due to an overturned caravan.
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Charles Howeson has been sentenced to seven years and six months for historic sexual offences against eight young men between 1985 - 1994.
The heatwave will culminate next Wednesday, which forecasters say could be the hottest day of 2018.
The Prince of Wales and Duchess of Cornwall visited the city in an attempt to encourage tourists to visit.