Powering through a left hand bend he's fine and taught, do the same through a right hand bend then it feels like the drivers side rear wheel is folding under the car.

I've jacked it up and there's no play in the wheel, coils fine can't see a shock leaking.

Any clues people?

Quite often play in the suspension/steering is masked when the car is jacked up due to the weight of the hanging wheel pulling out all the play.

You really need a bar in there to jemmy the joints and under the wheel.

Try the bushes on the wishbone first, they'll directly effect wheel camber, they were quite common an issue on the model before this.

I'd still check the left-hand rear shock absorber, there doesn't have to be an obvious leak for it to have packed up.

if you've described it right then a falling over on lock is usually because the tracking is well out
usually if some goons tracked one side up only