Today I'm planning out what I'll do on the day of the race (note: I am never usually this organised).

Here's what you need to think about:

Weather - check the forecast today to get a rough idea of whether you'll need to take a cheap umbrella or poncho with you to use before the race and that you can discard at the start line. Or if it's more likely to be an SPF, sunglasses kinda day.

Travel - decide now how you are going to get there; train, tube, taxi, car, coach and ensure you have mapped the route allowing enough time for delays. For example, I've booked my taxi for 7:30am which should get me there an hour early (allowing for traffic/delays) - enough time to go to the loo when I get there, and chill.

Breakfast - by now you should know what you will eat and drink before the race, stock up on these today.

Kit bag - you'll get a bag when you collect your race number that you can take with you on the day with all your essentials for post-race. Make sure you pack in there a protein-rich snack and water.

Go dark (like they do on 24) - I know I have mentioned this before but as much as you would probably love to respond to all the well-wishers who text and tweet you, remember you need to save your phone's battery life for during (if you're using it for music) and after the race. I am taking the Mophie Air Juice Pack iPhone 5 battery case charger, £89.99, in my bumbag in case I run out of battery during the day.

Supporters - if you have anyone watching you run - find out where they will be on the day or where you WANT them to be. You'll know then to look out for them at certain mile markers.

Tonight: organise all these last minute details to ensure on Saturday you can RELAX.

Check back tomorrow for a nutrition plan and shopping list that will take you from Friday evening to Monday.