Radio now aac rather than mp3

[bat guano]

Please do bear in mind though that (from my own empirical comparisons) it
seems the iPlayer just TRANScodes the original AAC audio to MP3, it's not
encoded fresh from the original source audio. So if you choose the MP3
option, you'll end up with a noticeably lower quality audio file.
**************

No that's not the case.

If I use this command:-
get_iplayer --get --type=radio --raw --mode=flashaudio --pid=b00ym9ff
The result is mp3 in an flv wrapper.
get_iplayer doesn't TRANScode - it just un-packs.

This is the result:-

Complete name          : Bells_on_Sunday_-_20_02_2011_b00ym9ff_default.flv
Format                           : Flash Video
File size                        : 2.77 MiB
Duration                         : 3mn 0s
Overall bit rate                 : 129 Kbps

Audio
Format                           : MPEG Audio
Format version                   : Version 1
Format profile                   : Layer 3
Codec ID                         : 2
Codec ID/Hint                    : MP3
Duration                         : 3mn 0s
Bit rate mode                    : Constant
Bit rate                         : 128 Kbps
Channel(s)                       : 2 channels
Sampling rate                    : 44.1 KHz
Compression mode                 : Lossy
Stream size                      : 2.75 MiB (99%)