Continued heatwaves threaten UK food security

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The author of the National Food Strategy sets out how we can become more resilient. Also on PM, Andy Burnham has officially entered the Labour Party leadership election. Our political editor joins us live and we hear from a leading economist who is encouraging Mr Burnham to overhaul the tax system. And, Bonnie Tyler has died aged 75. Sir Tim Rice joins us to share what makes her greatest hit 'Total Eclipse of the Heart' so brilliant.