OK... Engine pan off...vehicle upon stands... tried to undu the downpipe nuts which I think are the four accessible from above the engine and heres the rub. 13mm socket too small... 14mm slips round! Can see the the banjo holding the oil feed on no problem from below. Bit difficult to get to but not impossible. Then it's just a case of getting to and undoing the manifold nuts. That's assuming I can get those four bolts off! Help please!