Spoke to physio about shins. Verdict: posterior chain and Achilles tendon needs to relearn how to absorb force, causing the medial shin soreness (issue started after speedwork). Have some exercises to do (focusing on speed: med ball slam, ski jumper, rapid calf raise) and posterior flossing/calf rolling. Will give a few more days before returning to running but he said up to 3/10 pan in shins is ok. 4-5/10 tone it down and 6+/10 is a no-go. As I thought, need to allow legs to get used to running again so gentle build is still on the cards.