Hard to describe but when I'm slowing down approaching a junction or whatever, I get a weird "twitchy" feeling in the steering, almost as if it's adjusting itself and going really light for a brief moment. It doesn't affect handling or cause the car to pull to one side. There's no vibrations either and only 31k on the clock. Seems to be more noticable if road is bumpy.

Ttracking, alignment, toe, suspension and bushes are all spot on. Tyres are new and have only done 300 miles, pressures are fine. Decent tyres too, not cheapos.

I know this car has speed sensitive steering...could the weird feeling I'm getting be the steering adjusting to the decrease in speed? I've taken it to VW and they've said they can't find anything. I had a 2005 Polo before that and don't remember the same thing happening. It too had speed sensitive steering (maybe the 2008 one has a different system?).

Make sure that the power steering fluid isn't low.