Please do your research:
The Outdoor Swimming Society – Great advice for those swimming outside all year round
RNLI – Ice swimming advice
RNLI – Float to live
RLSS – Cold water swimming advice
Hypothermia – What happens when you get too cold and what to do
Transient Global Amnesia – A rare side effect of cold water
Swimmer’s itch – A potential annoyance of summer swimming, especially for those swimming long distances. Ideas of how to prevent and what to look out for
British Heart Foundation – Using a defibrillator
Non-freezing cold injury (NFCI) information website – Understanding NFCI
COLD WATER MINI GUIDE – Practical Tips for Safe & Confident Swimming Through the Colder Months by Alice Goodridge from SwimWild