New or uprated top mounts, then, a list as long as your arm of every suspension bush under the car.
Given its age as one factor, then if it's garaged or stood outside, some of the bushings may well be worth replacing. Getting it on a ramp or stands and having a good old poke around with a pry bar will indicate if any are worn to the point of needing replaced. The OE or some equivalents (thinking Febi Bilstein etc) are not too badly priced, it's the labour involved in getting them pressed in and out, and the new stretch bolt cost that can rack up the £'s