From the last cache, the official path appears to be to keep the wall on your right, then cut through the gate so the wall is on your left just prior to this cache.
In reality, at this time of year, there appeared to be no defined path or signage and plenty of tall thistles around the gates so be warned, the path may be a little difficult here.
Just before the last gate, there's a small stream to cross but bear left to the corner before you go through the gate.