Hi Rob...welcome.
Ahh Grantham - I used to know it very well a long time ago as I was brought up in Cleethorpes, but please don't hold that against me....
Brakes as per the guys above - I also found my S brakes initial bite a bit lacking, swapping to good quality pads made the difference but I found that the rotors were quite glazed.
A few 100kmh - zero soon unglazed them and there was a significant improvement.
The backend breaking loose could just be the cold weather affecting the tyres or perhaps the tyres are more than 5 years old and hardening. Plus at your mileage the shocks are probably a little below their absolute best.
Re the whine could also be the old / cold tyres "humming". With the top down you hear all sorts of noises not heard in tintops. My gearbox / transmission has a slight high pitched machine whine @ +/- 60-70kmh in 3 & 4th but the car has had that for most of its life.
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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