Singing Bobbies in the Birdcage!

I'm sure we have featured our group of "Singing Bobbies in the Birdcage" before but I can't find a caption for it so we would like to test yourmemories and let us know when this photo was taken -  if you don't know where then you are disqualified from answering -  and most importantly can you name them all.  We look forward to your responses. It might be easiest if you use Photos 2 and 3 for naming, and if you start with the front row and work backwards. One final question - is there anyone in the group who never actually sang with the Police Choir?