You timed this message well!
I had the final round of heart scans and the additional 6 weeks of low intensity did not further decrease the left atrial volume. This means that either I am back to my 'base' value or any further changes would happen too slowly to make sense.
So... the plan is now to get back to training sensibly. Easy runs easy (110-120bpm) hard runs hard (and no more than 2 hard sessions per week inc. races or tempo).
Will kick off the 2k on Thurs and report back.