Got to W7R1 and could no longer ignore agonising pain in achilles. After seeking some advice was very downhearted to discover I had to completely stop running for a few weeks and do lots of (tedious) Achilles' strengthening exercises every day. Ever obedient (hah), I did just that.
Yesterday, I started again W1R1 and it felt AMAZING. Admittedly, we're in the divine Isles of Scilly this week which are an awesome place to do anything anytime. Those exercises may be tedious but boy do they make a difference.