SSD,
One or two points. Care should certainly be taken when operating in the LLC as poor navigation can lead to problems for both Manc and Liverpool. In general though the LLC causes more problems for Liv than it does Manc. A small deviation into the Liverpool Control Zone and you will find yourself going right through the final approach track at the point where a/c are starting their descent out of 1800ft. The SID's at Manc are designed so that outbound a/c are normally well above the corridor when they cross or get close to it. The inbounds onto 06 will also normally be well above the corridor, due to descent restrictions caused by Liverpool Airspace.
As for the easyJet crews, they are all too aware of the corridor. Normally on a visual approach they will be 1800ft or above until they cross the western edge. Do not forget though, once they have crossed that edge and are inside the control zone, there is nothing stopping them coming down further. At Hatton you may well be seeing traffic that is positioning visually onto left base for rwy 27, that is inside the Liverpool Zone, albeit only just. However, this is another reason why good navigation is required in the LLC.