Audi A4 3.0 ltr tdi knocking from front of car then creaking noise when warm

[Beau1875]

I would describe as a creaking noise when car has been driven for an hour and warm, slight knocking to start with then in narrow side roads manoeuvring more heavy creaking sounds like steering rack or ball joint noise, steering is a little heavier than normal. I have replaced the anti roll bar bushes seemed ok for a few days then started again, any ideas guys.?