Instead of this player, you may be able to click on the following link, or else paste the link into an audio/video player:

http://as-hls-ww-live.akamaized.net/pool_904/live/ww/bbc_radio_four_extra/bbc_radio_four_extra.isml/bbc_radio_four_extra-audio=48000.norewind.m3u8