Ian and All,
I happened to look at my TP 1 SNR at 09:04 UTC this morning and it was steady at 13.7 dB and stayed that way for around 20 minutes.
Now at 09:25 it is back to the new norm of 13.3 dB steady.
Also my Power reading has been down a bit over the last few days from the last 2 week or more norm of -23 dBm steady to -24 dBm flipping back to my long term norm of -25 dBm every now and again.
[1 m dish, Inverto Black Ultra quad LNB, SR1]
Weather here is sunny and clear skies.