Today was the first day I have fallen behind in my distance. I am now 0.5km behind where I should be, according to our planning.

There is no margin for error anymore. I have no buffer for when this beautiful weather finally breaks and I have to stay ashore because of a storm. There is no buffer for if I get sick.

If the boat has a problem, or if we miss a current, that's it. I won't reach Dover in 50 days.

Whispers of inner doubt are starting to creep in, and it is getting a little harder each day to pacify them. The weight of expectation sits heavily on my shoulders.

My only hope is regaining the distance I've lost on later swims, especially during the spring tides around the new moon.

These fast currents will do half the work for me and I am planning on swimming twice a day to take full advantage of them - I will swim through the night if I have to.

The morale of my ever-supportive team is still high, though, and they are carrying me through in my low moments. I'm doing it for them, too. They have worked tirelessly for months just to get me to the start line. I will not let them down.

We were also joined for today's swim by Tom Allan, a journalist from the Financial Times. While there were no dolphins to show him or sea shanties to serenade him with, I relished the chance to clearly lay out the aims for the campaign to such a newspaper.

I hope his feature about the swim is read by those who have the influence to make a difference at the business and political levels that is needed.

Our message of marine conservation and protection needs to echo loudly from all directions down the corridors of power if we are to see real change.

6.18 miles (9.95km)