There's a new six part dramatisation of A Dance to the Music of Time starting on BBC Radio 4 tomorrow (Sunday 6 April) at 1500hrs UK time. Episodes are to be repeated the following Saturday at 2100 hrs. It also looks as if each episode will be available on listen again for 7 days after the broadcast.
The dramatisation by Michael Butt (in six 1 hour episodes) is part of the BBC's "Classic Serial" series. The cast includes Corin Redgrave (as Jenkins) and Anthony Hoskyns (as Widmerpool). Full cast list at http://www.bbc.co.uk/radio4/arts/classic_serial.shtml.
I don't know any more than this, except for the usual puff in Radio Times.