jamesah, every time I ask for a prompt, the experts prompt me to read the preamble more carefully - so I am repeating that to you - uncletony's prompt made me reconsider the terms 'in 21 clues', then 'the letters involved' and I realised that considering the two phrases together didn't necessarily mean that I had a 21 letter phrase - and, of course, I hadn't, if I had to 'redistribute the phrase in a manner hinted at by the phrase itself. You won't have a perfect second 'four word phrase' and 'theme' until you have performed that first 'redistribution'.