meant to post this ages ago! I was using the balloon arches to time my mile splits and they were pretty consistent apart from around Woolwich/Greenwich, the first 10 splits were:
1) 7:27
2) 7:20
3) 7:24
4) 6:43
5) 7:27
6) 8:06
7) 7:07
8) 7:29
9) 7:28
10) 7:28
Mile 4 was downhill so perhaps that could explain the faster time, but I don't recall being slow for mile 6 - mile 25 was the only other split over 7:33.
Did anyone else notice a discrepancy with the mile markers around the same time?
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It was out for me too by pretty much the same as you simon. I clocked 8.06 for mile 6 and 7.06 for mile 7. I knew it was out at the time as I was running pretty evenly at that point (miles 2-5 were all between 7.20 and 7.30, and I knew there was no way I'd run over 8 for the next one). So after I'd gone through mile 7 I just mentally adjusted the last two to say they were 7.30's on average. Not worth worrying too much about to be honest.
Mind you I could have done with some of the later miles being shorter than they were .
Just checked and I had mile 6 as measuring 1.23 miles!! I don't think I missed the mile marker, but it looks like I must have, and then pressed it at the 10k mat instead. Shows how much attention I was paying to the Garmin on the day though, cos I hadn't even noticed! Mile 6 for me was thus a 7'43, despite running it at 6'17 pace! I think that shows I may as well have not worn it for all the notice I pad to it on the day