For those of you struggling and/or feeling a bit downhearted as a result, it's worth keeping in mind that John Henderson aka Enigmatist, is also the editor and occasional setter of the Inquisitor in The i on Saturday as well as sometimes setting the Listener in the Times and the Toughie in the Telegraph.
I mention this because The Listener, Inquisitor and Enigmatic Variations (Telegraph) are collectively known as 'The Holy Trinity' and are considered by many, if not most solvers, to be the epitome of barred puzzles.
Hi Mattrom, that was pretty much the was I tackled it too.