The Telegraph can detail new allegations about what took place that evening, which is said to have seen around 30 people in total attend the leaving parties.

In the basement gathering – attended by those marking the photographer’s departure and not the event for Mr Slack, which took place elsewhere – music is said to have been played for hours. 

At one point wine was spilled over the printer on which the laptop blaring out music was placed, according to an eye-witness. 

There were fears it had been broken, but a government source said that no equipment was damaged. 

Pizzas were allegedly handed round

Takeaway was also ordered into Downing Street, it is alleged, with four large pizzas being handed round in the complex’s garden late at night.

Another new claim is that some attendees went down the child slide belonging to Wilf Johnson, Boris Johnson’s son. It has previously been reported that Wilf’s swing was broken that night.