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@Greenbank
If you do ever end up in water that cold, planned or unplanned, lie back and float for a minute until your body is used to it, otherwise the cold water shock can kill: https://rnli.org/safety/know-the-risks/cold-water-shock
The Serpentine was 15.1 deg C one year I did Swim Serpentine and I was glad I was in a swimming wetsuit and I'd also gone in before and got acclimatised to it before the main swim. There were a good number of people being helped at the start as they were hyperventilating from the initial shock.