Britain’s prime minister fights for his political life

The UK's Prime Minister Keir Starmer is still fighting for his political life amid open revolt in his own party; do the rebels have the numbers to oust him - or can he hang on? Also in the programme: a special report from Khartoum three years into Sudan's civil war, where land mines are hampering aid efforts; how enjoying cultural activities can help slow down biological ageing; and - a propos - we have an appreciation of Shostakovich's first symphony, 100 years after its premiere in Leningrad.