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Interesting, thanks for the link.
"It has a slightly odd length at 30.5m, which makes the maths a bit tricky when trying to work out how far I’ve swum’"
Only if you think of it in meters. 30.5m will be a 33+1/3 yard pool so 3 lengths is 100 yards.
Also:-
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Staff have been keeping the temperature at the usual 29C (84F) during lockdown
...
‘I always find this pool a bit on the cold side when I swim here, but the colder water does seem to sharpen up the stroke somehow’
"29oC cold for an indoor pool? What kind of insanity is that? Most aim for 26oC-28oC (and Olympic pool regs are 25oC-28oC.) I hate pools when they're too warm.
Here's a little photo essay on closed swimming venues in London:
https://www.theguardian.com/uk-news/gallery/2020/dec/01/deep-dive-empty-swimming-venues-during-lockdown-in-pictures