Right then, I now have 6 weeks off work so the car is going to get some love!
The engine management light/traction control light was due to a faulty MAF

I replaced the MAF with a new Bosch one from GSF last October and it has gone already

Anyway, £100 later and I've got a new one from VW and the car is running a million times better than before

Going to strip the rear brakes down next week, grease them all up & rebuild them to solve the binding, also going to strip the JOMs and fix them.
That'll leave axle bushes and PAS pipe to sort, then a new ARB and lower the front end some more!