For the last week or so my car has been feeling quite lumpy, bouncing about on the road, and somewhat tail happy. Really felt like the shocks were on their way out.
Thankfully, it was just tyre pressures. When I had it serviced they put in 32psi all round.
So, 30 in the back and 35 in the front and all is well again.
Moral of the story - check your pressures if you've some bizarre handling changes all of a sudden.