I was due to swim 5k in the pool last March for the BT Swimathon.  The event was postponed for obvious reasons, but has resumed in a different format - swim pretty much what you want, where you want.  I have therefore decided to swim the 13.5k length of Bournemouth bay in four stages of around 3.5k each - Shore Road to Durley Chine to Boscombe Pier to Bistro on the Beach to Long Groyne.