[Lypepuddyu]

What was the light sources? A rainbow is always antipodean to the light source, and at best you might see three on a single rain front using the sun as the source (with two and three each being less intense). I guess it is possible to have a secondary rain front behind the first, but 22 seems like there must be multiple artificial sources.

Steve's probably the best one to answer that, Stealth, but I personally think it was multiple reflections from the chalk in the cliffs. As far as I could tell, there were no other light sources than the sun.