Apologies, this was done over a few days.
Carried out a filter change and oil on the BTF transmission, Carried out a Oil change on the Diff (Found the large 28mm fill nut to be finger tight....)
Went to get a retune on the mods that I had previously carried out a few posts up. Got a phone call from the tuner saying the car is over boosting and unable to get the numbers back down to where he is happy with. Apparently with the work that I did installing the under battery intake and Plazmaman front facing plenum with 3inch pipework to the plenum the car now hits 17psi instead of 13psi in which it was originally tuned. They have advised I need an external wastegate to get the boost back down to where its safe. Live and learn I guess