A 35-year-old was attacked by two black men and a white man as he approached a taxi rank in Reading.
The victim was struck on the back of the head, causing him to fall to the floor.
The incident happened outside the taxi rank in Cemetery Junction at midnight on July, 13.
The white offender was 18 to 25-years-old with short blonde hair, skinny build, 5ft10ins tall.
The victim's mobile was also stolen during the incident.
More top news
The 'Let Our Kids Be Kids' campaign wants parents to keep their children off school saying they are "over-tested and over-worked".
Nicky Morgan is expected to defend the proposal when she fields questions at the National Association of Head Teachers' annual conference.
Phone charges in the European Union will drop by about 75 per cent from today as part of an interim cap ahead of a full ban next year.