3 IDENTICAL INDEPENDENT OBJECTS THAT LOOKED LIKE FLAMING LANTERNS - COLOUR IDENTICAL FLICKERING YELLOW/ORANGE... APPROACHED IN LINE FROM SOUTH THEN APPEARED TO TURN EAST OVER AMERSHAM AND CONTINUE TOWARDS LONDON. NO SOUND. HUSBAND,A FORMER PILOT, ESTIMATED APPROX.40 KNOTS AT 1000 - 2000 FEET. ESTIMATED SPACING 1000 FEET. NO NAVIGATION LIGHTS OR STROBES. EST, SIZE WOULD BE APPROX 20 FEET ACROSS IF AT THAT HEIGHT. AS DEPARTING THEY INTERMITTENTLY APPEARED AS IF SKIRTING CLOUD-BASE OR BURNING OUT. AT NO TIME DID THEIR FORM CHANGE. SPEED AND ALTITUDE CONSTANT.

MOVEMENT SEEMED INDEPENDENT THOUGH IN A LINE AND THEY CHANGED COURSE AS IF IN FORMATION. THE 3RD ONE APPEARED TO LAG BEHIND A BIT.

SIZE, SPEED AND HEIGHT ESTIMATES ARE APPROX AND COULD BE SCALED UP OR DOWN... CLOUD BASE THAT NIGHT MIGHT INDICATE IF SCALING NECESSARY . IF I HAD TO GUESS WHAT THEY WERE I WOULD SAY CLOSEST WOULD BE HOAX PERPETRATED BY MICROLIGHT PILOTS SHINING ORANGE TORCHES ONTO THE FABRIC WINGS. BUT... NO SOUND.