Above is the photo that was the last straw for Nigel Farage:

Tommy Robinson can be seen seated beside Gerard Batten. Next to Robinson is a man called Daniel Thompson, a convicted armed kidnapper. There are other pretty unsavoury-looking characters dotted around the room. These are the people organising the ‘Brexit’ march that is now advertised on the UKIP website. My heart sinks as I reflect on the idea that they may be seen by some as representative of the cause for which I have campaigned for so much of my adult life.

His Telegraph article lambasts Gerard Batten for being obsessed with Islam and Tommy Robinson. He concludes

We are now just a few days away from the most ill-judged political event I have ever been aware of in British politics. The very idea of Tommy Robinson being at the centre of the Brexit debate is too awful to contemplate. And so, with a heavy heart, and after all my years of devotion to the party, I am leaving UKIP today. There is a huge space for a Brexit party in British politics, but it won’t be filled by UKIP.

Hard to disagree.