176 max though?
I wouldn't be barffing until 186!
Brill session mind, espec as you were on your Todd.
The last time I got my heart rate over 178 was before the Millennium - in fact, I've never seen it above 185, ever. I'm not a proper athlete, see, I told you!
Good work and puts my times to shame! If you remember we did virtually this same session together in the freezing cold a few days before the end of 2007 - the difference is that your session this week was faster than we were then, and my session this week certainly wasn't.....
oh yes! I've just looked it up - yup, barring the 75s first lap, I was faster today, yippee!
As for your times, Jon, your recent injuries and consequent lack of training have to be the reason you're slower just now. That means that you'll improve far more quickly than the rest of us!