I have decided that it would be a good idea to enter a dedicated training day around 4 weeks before the 70.3.
The Humna race event - http://humanrace.co.uk/events/triathlon/triathlon-training-day covers the following aspects.
These are just some of the things you will cover:
Swim: Open water swimming techniques including group starts, course sighting, turning, removing wetsuit etc. There will be special provision for nervous and first-time open-water swimmers.
Bike: Bike set-up and body position, bike handling skills including drinking on the bike, turning and efficient pedalling - and what do you do if you have a puncture!
Run: Efficient run technique, good warm up and post exercise stretching, pace judgement, correct shoes.
Transition: Kit layout, options to save time, applicable rules.
Numbers will be limited so early application is required.
With one super sprint triathlon behind me at the point it should be invaluable in showing me how to improve on mistakes I am going to make.