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Hi there's a switch on the brake pedal, brake pedal has to be pressed before it will release, check connector/plug is securely on, you could operate the switch and actually check its working also if it was put in park before the park brake was applied, the weight of the car on the park mech could be holding it, especially if its parked on a slope try releasing the park brake and rocking the car and see if it will release, watch the car will not roll away it it releases, put some blocks a few inches in front of the tyres just check you steering lock has released also, tension on the steering can also stop the steering lock from releasing you could also try disconnecting the battery if none of the above work, its plug in and see if there's any fault codes cheers Joe

OK, just had a call from the mechanic The DPF level is apparently shown to him on screen as a value in g/m3 (Grammes per cubic metre) in his JLR software. The mechanic confirmed that mine had recently successfully done a regen (on my recent journey down the A3 - which I had used for the purpose) this was not obvious at the time as it's all done cloak and dagger style which is one of the problems as it would be nice to be aware of the activity. .. So anyway my soot level today is .. 16 g/m3 which is in fact not exessively high at all - thankfully My vehicle mileage is 87'000 miles which is pretty high for a 3 year old car but as much of this was likely motorway driving I think my DPF is probably based on the above number in a better state than many lower mileage XF's. He informed me that the higher the soot level the longer it takes to clear, at 60-70g/m3 it takes him several hours of driving under a forced regen to clear it and at that point the cleaning is less effective and at 70 or higher is where he considers replacement options 90+ is a definite replacement as it will never be effectively cleaned in situ. He is taking my car out this afternoon to force regen it using his laptop and believes he can get the soot level down to around 6 g/m3 which leaves me in a good place. My bill for this will be around £150+Vat I now plan on getting some software for managing this myself via the ODB connection (and will post details here) - I think that this is an essential given the complexity and black box nature of modern cars - my hope is that I will ideally be able to initiate a regen on any significant motorway journey or when required. It will also allow me to monitor the health of the vehicle generally (and as ODB is standard since about 2003 I can use it on the other family cars too) to be continued..

I have got the ultimate solution to the DPF issue and its relation to short trips. I will not do any more short trips to places like supermarkets, garden centres etc in my Jaguar 2.7D. I have bought SWMBO a car -- A Toyota Yaris Hybrid. It is currently averaging 76.3 mpg, and the Road Fund licence is £0. Peter.