Bad NTS on Radio 2 recording..

[af123]

I haven't seen anyone else report the zero NTS problem occuring on a radio channel, but I've just found this from last week:

umax# ls -l
total 211M
-rw-r--r-- 1 root root 2.1K Feb 12 17:01 BBC Inside Science_20150212_1630.hmt
-rw-r--r-- 1 root root  0 Feb 12 17:01 BBC Inside Science_20150212_1630.nts
-rw-rw-rw- 1 root root 211M Feb 12 17:00 BBC Inside Science_20150212_1630.ts

humax# hmt *hmt | grep '^Duration'
Duration:0

The .ts file looks good but I have an empty .nts and 0 stored for the duration in the .hmt.
sidecar doesn't help here (didn't really expect it to as it indexes video frames).

 

[prpr]

What's in the .nts file normally for a radio recording then?