Home now, I can start looking at the recordings.
It looks like both networks went off the air during the same cycle, roughly at 2312:40z.
T!
(edit)
Pips were on the air unbroken from 2152z (already in progress) until 2312:40z. It looks as if both networks went off air within one 6 second cycle of each other.
Initial look at frequencies shows these active:
6225
6550
6725
6750
7700
8275
8825
8900
8975
9050
9225
10050
10450
10575
11025
11150 (2 pulses)
11225
11300
12025
12450
13250
13325
13500
13875
14400
15100
15400
15550
15625
16000
16350
16550
16725 (2 pulses)
17475
17650
17950
17975
18050
18100
18450
18625
19300
Most of these are the same as seen before. There are one or two new ones. I will check old recordings to see if they were always there and just noticed (most probable). Frequencies did not extend as low or as high as they have in the past, but that could just be conditions.