My 2006 Ka has developed a problem whereby it "hops" up and down at low speed. I have checked the tyres for bulges but cannot see any (although the tyres are admittedly very old). Further to this the car pulls to the left on acceleration - any ideas welcome as I'm new to old Kas, cheers.

Is this an Australian import ?

Sounds like you have the Kangaroo model with socialist leaning. 🤣

Tyre out of round would be my guess. Pulling could be the same cause or alignment. Try putting the spare on each hub in turn 

If you mean pulls left on sharp acceleration but not on gentle acceleration, it's probably torque steer.

So we went out in the Ka on quite a long journey yesterday and it was frightening. The car was wobbling and felt like one of my wheels was buckled. Today I looked underneath and found that the lower suspension arms are shot - the rear bushes are nearly non existent so the arms are more or less free to pivot around the front bush meaning that the wheels are not fixed but free to move forwards and backwards. Question - there seems to be a lot of these arms listed - is there a part number for the correct left and right arms please? It's a 2006 Ka studio 1.3 Duratec with power steering. Ta.

Update - I bought a pair of good quality arms and watched a YouTube video which showed such arms being changed implying that the process was easy - six nuts and bolts and two additional nuts - how hard could it be?

I further checked Haynes and set about the task. This led to six hours of straining and gibbering under the Ka. Of course it wasn't easy. All of the nuts and bolts were seized and frozen and needed loads of breaker bar and heat teasing to get them off. When the old arms were off fitting the new ones was made difficult as the hub gets on the way when trying to refit the bush bolts. The passenger side arm was especially difficult as you cannot fit the ball joint first as the bushes then don't line up, and if you fit the bush bolts first the ball joint and retainer and so far apart that a second person is needed to distort the arm with a long bar to get the ball joint in. Well it''s done now but to be honest next time I'd get a garage to do it.

My Ka now drives much better and no longer lurches