Delighted to say I've just completed. This would not have been possible without consulting this thread. The puzzle, which I started off thinking impossible, has given me deal of pleasure so thank you all. Please ignore the sour note earlier.
As it's Friday I can risk giving a little away as most will have completed or given up. As a young pup I was of a left-flipper persuasion and we used to sing "Red fly the banners oh!" I remember: seven for the Tolpuddle Martyrs amongst other lines.
Do please keep contributing.