Musket90,
Well observed. That threshold has been displaced since the late 1970s, due, (as far as I'm aware), to the proximity of the houses on Ringway Road. I remember a large headline on the front page of the Manchester Evening News many years ago which had a photograph of displaced/missing roof tiles and an overflying jet. Above the picture were the words "AIR VORTEX TERROR".
On 05L, the similarly long-standing threshold displacement was introduced to move the touchdown point away from the roof of the Altrincham-Wilmsow road tunnel.