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stevielarson
DC Rainmaker has something to say about wrist based HR. Scroll down to the "HR accuracy" section: http://www.dcrainmaker.com/2016/02/garmin-fenix3hr-review.html
My HR strap (HRM-1 connected to an Edge 705 when cycling) used to go >220 some times, and often in exactly the same place (Danebury Avenue, Roehampton near where the buses turn round). I think it's something to do with either buses or the comms they use to speak to TFL's tracking system.