Thanks for the seat on the injury bench and all that but it looks like I'm OK.
Just done a tready run of warm up, 3M at 8min/miles, recovery, mile in 8 mins, recovery, half mile in 3:45, rec, half in 3:45, cool down - sort of like Yassos but I didn't have the time for all the recoveries if I did it in 800s. Not a trace of yesterday's spurious knee problem. All other joints and muscles in fine fettle.
Higs