After having the car serviced and inspected at a very highly regarded local VW Indy, it’s been confirmed the suspension setup is currently seemingly standard and in general in good condition.
After a lengthy chat with the owner who is a big enthusiast and multiple Mk5 Gti owner, I’ve settled on the super pro ALK with fresh oem ball joints and drop links, he was confident that would leave the car driving very well with the option to then add a roll bar upgrade kit and/or a damper/spring set.
I am going with his advice and the parts are being fitted in a few weeks, will report back the results.
Also off topic, pre-cat delete also being carried out at same time, he said that’s one of the best value mods on the Mk5 so I’m getting that done too.
Just the service along with the gearbox oil change has made the car a lot better to drive though so heading in the right direction