Will the BBC's Berlin Wall podcast hit lead to a more informal Radio 4?

The gripping Tunnel 29 is on 3 million downloads and counting, Tom Stoppard’s new play is his most personal - and the Turner prize gets wokeLaunched this autumn, Tunnel 29 has become the most unlikely BBC podcast hit. This 10-part story about the digging of a tunnel under the Berlin Wall in 1961 to help people escape from the east to the west has so far garnered more than 3 million listeners. Admittedly it has been plugged hugely on Radio 4 (where the series also ran in late October) and e