Police have released video footage of Lee James confronting Bijan Ebrahimi in his home.
During the exchange, James tells Mr Ebrahimi that if he calls the police he will tell them he was taking pictures of him, adding, "How old are you? I'm a little boy".
Mr Ebrahimi calmly tells James to leave his house, to which he responds, "Trust me, if you take pictures of me again I'll f*** you up".
More top news
Seasonal rains have battered the country since late June with more than 150,000 people affected by floods and landslides.
The bus reportedly hit a tree near Russell Square.
Low pressure will throw cloud and few showers across the UK today, but it will also draw in very warm air from Europe again.