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Just checking in, to report that this morning, resplendent in my new shades, I set a new PB at 5k, breaking 22 mins for the first time.
Thank you all once again for your comments and advice.
( Less than £100 a day, so far Chris, but I'm certain that figure will come down considerably )
Good stuff XL. Buy another pair and reduce your PB again!
I obviously have some work to do to remove 20s from my 5k PB.