This is the sunshine reflecting off the sea 30 miles away over towards Bude as viewed from the car park at Row Tor
near Okehampton Army camp earlier in the day. Bridge camera zoom like 600mm.
That's the big utilities transmitter at Castle Cross in the middle. I only notice this reflecting sea effect on high summer evenings (May to early August),
probably due to sun being high enough in the sky at that time of day.