I have noticed that when I am turning right there is a knocking noise from the rear drivers side.

I recently had the exhaust replaced and I am guessing that the problem started after that.

The exhaust is secure so I know that the exhaust is knocking on the underside of th car. Also going over bumps doesn't cause the noise.

Any help will be appreciated.

Hello, i had a similar knocking noise on my Renault Clio a few year back, it turned out to be shot wheel bearings!!!!

could be the rear bushes

could still be the exhaust, take it back an say its knocking, just need undo 1 nut n twist it a bit

It could also be your radius arm... mine went a few months ago and had the same problem on the oyther side...

Being a mk2 punto, can not see it being buses or arm as it does not have a arm, could be a shocker nosiey or a bolt coming loose, or as you say the exhasut not fitted correctly. Nothing in boot rolling about