sentences:  Besides the regular vinyl single release of 1 June 1979 a picture disc edition was issued 6 July 1979.The B-side to "They Don't Know" was MacColl's recording of her composition "Turn My Motor On" - some copies read "Motor On" - , a setlist staple of Drug Addix, the band MacColl had recently left (consideration had been given to making "Turn My Motor On" the A-side).MacColl's "They Don't Know" reached number two on the Music Week airplay chart without generating sufficient sales to reach the UK Singles Chart - a shortfall blamed on a strike at the distributors for Stiff Records keeping the single out of stores, although its producer Liam Sternberg attributes the failure of "They Don't Know" to ill feeling which developed between MacColl and Stiff Records president Dave Robinson