replace the wishbone rear bushes with the cupra TDi ones
they are rock solid

and only cost about £7 !
put these in instead of the standard TDi sport FOAM ones

and the difference was quite amazing tbh!
top upgrade!
to knock the old ones out take of the sub-frame monting and get it in a vice, so much easier than trying to do it on the car i found!
then use the vice to press the new ones in
just make sure you note the orientation of the hexagonal hole!