A UFO has once again been seen performing aerobatics above the Herald patch. A multicoloured ball of light was seen by a startled Cheshunt couple, who videoed the 'close encounter of the third kind' on a mobile phone. Mary Georgiou, of Southmead Crescent, contacted the Herald after reading our story last week about the 'Hertford Fireball', which blazed across the sky on December 7.