Stephen Gilbert MP (Lib Dem, St Austell and Newquay), poses with the parliamentary lifebelt he used to rescue a woman from the Thames.
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The heatwave will culminate next Wednesday, which forecasters say could be the hottest day of 2018.
The Prince of Wales and Duchess of Cornwall will be visiting the city in an attempt to encourage tourists to visit.
Aerospace firm Airbus has warned it could pull out of its Filton base in the event of a "no-deal" Brexit, putting thousands of jobs at risk.