I had to have another stab at Cee's challenge -blue- and I have brought it home to Guernsey in the Channel Islands. We are very fortunate to enjoy an RAF Battle of Britain air display in September every year and this year the conditions for flying and other shenanigans were perfect. No matter how many times you watch this display, you cannot fail the deep intakes of breath when they pass one another with such precision. The challenge word was blue so that's what I offer you – with a tantalising taste of some of the display.
Have a wonderful day!