back end slips out while going left above 40mph

[TomBear]

i have a 1.2 mk2 ph1 and while going round left hand bend the rear seems to not grip that well over 40mph / feels very odd

the drivers side rear tyre is worn but still legal
but the passenger rear is nearly new
and the front 2 still have about 4mm left

is this problem tyre related?

 

[DrR]

Tyres or dampers IMO

 

[Tom@JMS]

blown rear shock possibly, look under the car at the lower part of the shock at the back, it should be dry looking. If it is all wet and black (in comparison to the other) that's probably what is causing your problems.

 

[White16valver]

Wheel nuts on properly?