Have had this problem for a while. Basically If I drive on a smooth road at around 10mph then i have a regular side to side twitch, enough to feel it in you seat. Dissapears at higher speeds (or at least you dont notice it). over the years all hub bearings etc replaced as well as polybushes all round. Even did the A frame ball joint last weekend and still there. Almost as though wheel may be buckled. Will poss try and get it on a rolling road, axle by axle to see where it is coming from. Rear I think.
Any more suggesitons as to what it could be??

I had the same on mine, it was a tyre that had gone out of round, changed them and it was a revelation. Jack it up and give each wheel a spin mine was ready to spot once I checked them.

Thanks, do you mean it was sort of bulging? So new tyres needed?

It was egg shaped, bulging towards the tread rather than the usual sidewall egg, mine were quite old MTs so I bought a set of 4 insa special tracks and it drove beautifully after they were changed, although it's all relative when talking about special tracks.

Spot on, it was horribly out of shape. One new tyre sorted it, now saving up for the rest. Thanks for the advice