Temperature 21 degrees celsius (nightime)Visibility was absolutely perfect. Not a single cloud/fog/mist whatsoever.Every single gold spec in the sky was visibleSky was a extremely clear and dark blue( not black)The skies were totally clear, was one of the hottest weekends so far so no clouds whatsoever and every star/gold dot in the sky was 100% visible. Sky was a navy/dark blue almost black, every star was visible. Was staring at the sky as I watered the plants in the garden, staring at all of the gold specs in the sky. I suddenly noticed an M shaped formation (but imagine the legs of the 'M' have been pulled out so the M is wide at the bottom) consisting of fairly dim gold/white dot lights flying together in unison. For a second I thought nothing of it until I saw a trapezium shaped object that the lights were coming from. The craft was transparent black, very flat, but very distinguishable from the clear night sky. The UFO was flying slower than any plane i had seen in the sky that night, and very low, about 3 storeys high from the ground and glided through the sky without making a single sound. The lights stayed lit i.e. didnt flash or dim etc. There were two lights at the bottom of the M that were slightly 'stray' as they moved slightly eratically and werent in line with the M but stayed in the M formation.The craft was a smokey transparent black colour. Although translucent the object was very substantial and i could differentiate the shape and edges of the craft clearly from the night sky. The colour of the craft appeared to fade slightly and then reappear, as though an invisibility switch was being switched on and off, however the dotted lights in the M shape remained lit.It flew very low but the front of the craft was at an upward slant. It carried on in its direction until it quite literally faded out the further away it moved. The craft was not a helicopter/plane as i had seen about 8 of them that night, and the craft didnt have flashing bright lights/blue red etc as airplanes do.