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Update - main dealership provided information and estimate to my satisfaction.
I have a Peugeot 407 2.0 CRD SW 2006 (56) which appears to have a ' lag' when selecting gears (and slow to respond especially under strain i.e. uphill) - someone has suggested re-calibrating the electronic chip to re-set the vehicles computer to improve performance (approx. £130.00) - the vehicle drives well otherwise and holds speed when attained although it is slow on the uptake (no immediate 'oomph' when accelerating) - car has done 90,000 miles?