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Jimm
@Greenbank
(Not a medical professional.)
Any change in your resting HR? Do you (or your watch) monitor that in any way? If I had any significant change in my HR at rest I'd get things checked out (probably by going to A&E).
I suspect that your HRM started misreading just after the 1km mark. If that graph is actually accurate then I'd definitely recommend getting checked out. Your nearest NHS walk in centre should be able to help.
If in any doubt ring 111 and ask their advice on what to do.