It's called 'A Minute in March' and is available at
https://www.smashwords.com/books/view/595939 . Entering the coupon code GV85P enables you to download it for free before Feb 27 2016.
A useful insight for anybody wanting to adapt to cold water swimming. If you enjoy it, please tell a friend. If you don't, please tell me and I'll feed back to the author.
Many thanks and best wishes,
Lsurfa