Police have explained why a Christian group were told to stop preaching outside one of London's busiest stations - but said the decision would be reviewed by a 'senior officer'.

A video circulating on Instagram shows a female British Transport Police officer telling Christians to stop spreading the gospel outside King's Cross station, adding: 'I just think it's wrong'.

The short clip from the bizarre confrontation sees the officer telling the evangelists 'it's so loud'.

She continued: 'These people just want to do their journey, they're not coming here to listen to you.'

The preacher replies: 'If I was doing a happy, clappy song it would be okay?'