This morning I woke in one of the most iconic parts of Dorset's Jurassic Coast - Lulworth Cove.

We were bobbing right in the middle of the cove, where we had anchored after sunset the night before.

I wandered up on to the bow and started to stretch out my neck, back and shoulders.

My shoulder, particularly, has been stiff for days. But, this morning, my left was far beyond stiff - it was now acutely painful.

I asked my trainer, Nicola, to have a look. Tendonitis, she thinks.

I needed to see a physiotherapist as soon as possible. I wouldn't be able to keep up my distances every day when I'm in so much pain.

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By a stroke of luck, the head doctor at Premier League football club AFC Bournemouth has offered to see me tomorrow morning with one of his physiotherapists. I just had to get through today's swim.

By midday, the cloud had burned off and we headed out of the protection of the cove and into the open ocean.

The wind and swell looked like they were ready to spit me out. There was a force five wind and moderate to rough seas.

But, unlike recent days, they were behind me, pushing me in the right direction. For once, the sea was taking pity on me.

If it felt like I was swimming uphill a few days ago, today felt like I was swimming downhill.

Even with the stabbing pain in my shoulder, I managed to swim the fastest 10km I have ever swum, in 1 hour 25 minutes.

For every stroke I took, I was pushed 30m, 40m, 50m east. Just by treading water, I was moving 10 extra metres towards Dover.

This is the first time I've experienced such a strong current on the Long Swim, and it couldn't be better timed.

Despite the successful swim, I am physically exhausted.

Yesterday, we were celebrating reaching the halfway point. Yet, today, I'm in so much pain that I don't know where we stand.

Tomorrow, I'll find out what's wrong with my shoulder and if there's anything that can be done.

6.2 miles (10km) - Total 180 miles (289.65km)