I though I would post my final findings. . .
It seems that all the problems started with the private plate which is registered to the car. The previous car the plate was registered to was a PF A8 with an earlier DTD gearbox (which happened to be on Audi's system) and so the incorrect filter was ordered.
New filter fitted (correct version with the shorter pick up tube) with fresh Mobil ATF and it's running beautifully smooth, as it should be.
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Currently driving - '99 Silver A8 D2 FL 4.2 QS
Currently for work - '08 Raven Blue T5 174
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