Confirming Jim Carroll's confirmation:
[1990:] In the course of collecting actuality for 'The Travellers', the radio-ballad on nomadic peoples, we recorded the following passage from Misty Smith, a gypsy woman in Cobham, Kent: 'I was expecting one of my children, y'know, one of my babies, and my son ran for the midwife. The policeman came along, 'Come on', he said, 'get a move on! Shift on! Don't want you here on my beat.' So my husband says, 'Look, sir, let me stay - my wife is going to have a baby.' 'No, it doesn't matter about that,' he says, 'you get off!' They made my husband move and my baby was born going along while my husband stayed on the road. Born on the crossroads in my caravan. The horse was in harness and the policeman was following along, y'know, drumming us along. Born on the crossroad!' (Notes Ewan MacColl, 'Black and White')