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@TheCatMan
Well, since you ask, 37 and fit - resting HR c. 50 (high 40s if I'm really rested and been eating & sleeping well). I wouldn't have thought that 183 was my threshold although my max is just under 200 (I think I hit 195 on the last uphill kick of this particular route - the E83). When I was running last year, it would peak at 197 if I was putting in a final 60 second all-out sprint at the end of 10k. In the absence of lab tests I had assumed a threshold of around 173 - based on what I could sustain for >5 minutes on the turbo and/or what I could hold at on hills before I felt like I was going to blow up.
The going easier bit intrigues me - I had wondered why, on the 10 mile TT when I was going at 183bpm avg I averaged 22.4mph yet if I look back 2 weeks in the training diary I did a much hillier (ok, ok, its Essex, its relative) evening training ride and covered 22.4 miles in 1hr 4mins, avg 20.8mph and avg HR 164 bpm. Whilst it was a good workout on the training ride - it certainly wasn't maximum effort all the way. Comparing the two I don't seem to have gained much in the way of avg speed for the additional effort during the TT. (conditions almost identical by the way).