I guess the slip road of J2 didn't need to be such a huge interchange to funnel motorway traffic right up to Moreton Road. It's clearly designed to handle more traffic than it does.
J2 did end at Moreton Road up until around 1989 when the bypass was built that carried on underneath the bridge towards Saughall Massie.
Some of the houses on the horses hill (little lane at the side of the motorway opposite Upton Manor) suffered with subsidence due to earth excavations in the 70's.
Does anyone remember the swimming pool next door? Is this it on Upton's website?
http://www.upton.cx/newwebsite/upt67.php. The boiler house existed at the back of the scout hut into the mid 90's.