Mr Cummings, the prime minister's former top aide, has had a high profile falling out with him and is now criticising his handling of the crisis.

Mr Cummings, the prime minister’s former top aide, has had a high profile falling out with him and is now criticising his handling of the crisis. (Picture: Getty)

Dominic Cummings has posted a screenshot of a Whatsapp message he says is from Boris Johnson, in which the prime minister appears to describe Matt Hancock as ‘totally f***ing hopeless’.

It was in response to figures about the low number of Covid tests being carried out earlier on in the pandemic.

Mr Cummings, the prime minister’s former top aide, has had a high profile falling out with him and is now criticising his handling of the crisis.

He published a blog post including several Whatsapp messages they exchanged.

This is a developing story. More to follow.