Westbury "saw-tooth" intervals - 30,40,50,60 x 5 - with 15s rest and 90s between efforts. Fairly hard but maintaining good pace - just a bit slower than 3:00/k for most of it.
Would include the GPS plot but Polar Sync is now properly fucked - it will tell me the distance, km times, calories burned, recovery time etc - but won't upload small and minor things like, say, the GPS plot... Given people have been complaining about having this problem for two weeks now felt it was a good time for a strongly worded email to inform them of my dissatisfaction.
Actually - sorted in only 4 hours... Some good, honest, home-made software on github succeeds where Polar's official sync cannot - able to extract GPS plot, and assign it the correct start time!
https://www.strava.com/activities/282380214