In message , Tim+
writes

We see a fair few of these near Prestwick, particularly when
international tensions are high.

https://en.m.wikipedia.org/wiki/Lockheed_C-130_Hercules

You generally WON'T see them on flightradar24.

Yes, I am rapidly coming to the conclusion that what I saw was a pair of
Hercules transports. Nothing else seems to make sense.
--
Graeme