Getting back on topic, I've since serviced my ZF with GW SYN-TS which has improved it. Definitely made a difference, but seeing my trans hadn't been serviced since it left the factory I'm sure any approved fluid would of helped.
Now, one thing I have noticed is if im at 60-70% throttle & in 2nd gear, I can feel the transmission 'slip' into 3rd. I still wasn't sure if it was a slip until today after a squirt at WOT from 2nd into 3rd gear it registered a 'Transmission Fault' on the dash, I turned off the engine & started and it was fine. Any ideas what this may be? Torque convertor not locking properly? As I said, any ideas would help & it will only do it under this throttle application & in 2nd gear.
Fluid was changed as per the ZF PDF file on here.
I get a funny feeling the car has been babied most of its life, possibly making me believe the transmissionhas 'adapted' to a lazy shift. Now thinking of tuning it to help these symptoms.
I've checked coolant & fluid obviously, no sign of milkshake anywhere.