No worries
The subframe bushes can just about be inspected visually and physically with aid of a pry bar. Parking the car on a kerb will allow sufficient access...
Equally if you press on a bit in the twisties and the back end feels like it is connected by jello, then they are probably toast...
Same test for diff mounts, although the weight transfer off a broken one is sudden and more pronounced, especially in the estate... But best test for these is reverse the car onto ramps and, whilst SUPPORTING not Lifting the diff with a trolley jack, undo ONE diff mount from the chassis... If it drops more than 1/4", is floppy* or simply falls off, then it's toast. Refit and tighten then test the other side
Whilst on ramps look at the donuts... Pop the pry bar between the triangular plate and subframe and try to push the subframe up with the bar... Again if it moves easily or clonks, then the donuts are shot.
*Like Alan Carr in a convent shower rather than a chocolate moose