A mile boshed out tonight, having already run 16 miles at lunchtime.
I decided to use the pull buoy for 50m every 10 lengths. The aim was to focus on technique then, and to try left hand side breathing. More work to do on that topic. I'm currently breathing to the right every time I right stroke, so that's every 2.
There were occasions when I noticed that I was sipping air from the bow wave trough. Oooooo eeeee, get me. (Cough splutter, over hydration).