Cloud Iridescence

Went to the osteopath's in Bolton and drove there today as I needed to do a bit of shopping on the way home. I need to buy a new clock radio as mine is not DAB+ and after much trying I couldn't upgrade it. My favourite radio station is now only on DAB+. I looked in Asda, Curry's and eventually bought off the internet!!
When I got home I looked up and saw this cloud rainbow.