Practice, practice, practice!
From now until 23 April, every Sunday should be a mock race day, with less miles of course.
Go through the same routine every Sunday. Wake up at the time you plan to on race day. Eat the same breakfast.
Think about what you're going to eat.
How much is enough? How much is too much? Does it sit right in your tummy when running? How soon after do you need the loo?
Prep for your run
Know what you need to do physically AND mentally before your long run.
Is your playlist up to date? What is your warm-up?
Start your run
The start time of the race will be in your final instructions magazine, which should be arriving soon if you have yet to receive it. Start your runs at this time.
Running, running, running
Practice your hydration and fuelling methods (jelly babies, gels, etc) and understand how much water and how often YOU need to refuel. Everyone is different so it's best to practice now rather than on race day!