We did a long, and often wet, walk along the coast path. There were some lovely blue sky intervals though, and this is one. 
I didn't know that circular rainbows (or should that be raindoughnuts) are visible from an aircraft.
When a secondary rainbow forms, the higher and fainter one will have its colours in the reverse order from that of the main.
Extra 1: Searching for the pot of gold. 
Extra 2: Wet rosehips (not as wet as we were.)
Extra 3: When we were nearly home, rainbows were still forming.