Good Morning all, I have just managed to complete this one - another brilliant puzzle for this year. I struggled with 20a mainly because it isn't in my copy of chambers, nor in chambers word wizard, but google helped. As for 30d, I cannot parse it at all, but hopefully is has a redundant E in it somewhere? The 29 letters proved to be as challenging as the clues, as the message seemed to be gobbledegook for a very long time.