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Contaminated fuel

I recently took my 2008 Jag XF for a routine service at a main dealer who reported a problem with the injectors. On removal the diesel was found to be contaminated with 30% (est) petrol which invalidated my warranty. The vehicle has never been misfuelled
The last fill of 56L was at a Shell service station and both the receipt and the filling station confirm that the fuel came from a diesel pump. The Jaguar dealer drained the tank of the remaining 25L of fuel and sealed it into a container sealed by chain of custody.
I have contacted Shell customer services but have yet to receive a reply other than an acknowledgment of the email. The diagnostic work has so far cost some £450 but the total bill is likely to be in the region of £5700.
I am uncertain how to proceed and any advice would be appreciated.

Asked on 26 December 2015 by theanalyst

Answered by Honest John
Any action you take has to be against the filling station where you procured your last fill of diesel. Since it was for a substantial 56 litres and 30% of the fuel in the tank is petrol you have a strong case. There isn't enough capacity in the 70 litre tank for 30% to have been petrol without coming from that fill at that pump.

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