I had to walk half of the slower intervals to recover from the 165BPM bits so I trudged home at the end with Laura's consolatory words "a bad run is better than no run at all" ringing in my ears. My lungs were screaming at me after a minute of near sprinting pace - I could not do 150BPM as recovery!
Anyway, I plugged in Lime Green Laura and she says I did my fastest ever km and fastest ever mile. My fastest km previously was running down a big steep hill so I must have been caning it today?!?!