Took the car into a garage and got the steering arm and both rear banana arms changed.
Changing the banana arms has cured a knocking sound from the rear of the car which has been annoying me for as long as I can remember and the car handles as well as it has for years.
Cost was £270 for the parts and labour + £29.99 for the MOT at Halfords meaning another year's motoring for £300. Not too bad.