In reply to BlakeyDerbyshire:
Chalk is the one area where you need to be a bit creative. An ordinary chalk bag is pretty useless after one swim. The solutions I have seen are:
1. Liquid chalk topped up by chalked shorts/forearms that you dab your hands on as you go.
2. Small drybags around the waist used as a waterproof chalkbag
3. Sandwich bag in the chalk bag
4. Cut bottom off a plastic water bottle, string on some cord and fill with chalk.
It's pretty rare to need a rope to get in.