Went to the shell garage on the edge of Rushden. I was down to the red light light,, so managed to put 65 litres in. Bloke who was sent out to pump it out said it was definitely petrol and he said you'd done well to do 15 miles. Must have been the last knocking of the diesel. He couldn't get it started, so awaiting been flag to get back to me. Originally they said they were going to recover it to a garage they use for such cases. My indy said I'll need a new fuel filter.
If it's confirmed petrol, be aware that you may need more than a filter change. Petrol in a diesel can lead to big failures, not only is it much more volatile, its being injected into the engine at extreme pressure, compared to petrol injectors. Great possibility of pre detonation, both at the injection, and also at compression, (compression rates are a lot lot higher in Diesel compared to petrol engines). If there was pre-detonation, this could cause excessive strain onto the piston heads (as well as conrods/crank) as the pre ignition explosion would in effect be trying to force the pistons backwards before they had reached top stroke.......all worst case scenario though.
You do need to run a full fuel system flush though, as well as draining to make sure there is no petrol left anywhere in the system. Once that's done, it is then important to run a fuel system conditioner through with the next part tank of fuel, preferably letting the engine tick over unloaded for 20-30 minutes too. This is because the petrol that's been through the system (pump and injectors) would act like thinners and strip the natural lubrication they receive from the diesel....otherwise these parts may fail in the near future.
I will say though, that I filled up with half a tank of premium from the same garage (Croyland Motors) on Saturday afternoon, without any ill effects (I'm presuming that Croyland only have the one holding tank?). I generally don't bother with the premium, and use standard and add my own additive, as I don't think you get as much bang for your buck as that you do for premium unleaded, but I hadn't got my bottle in the glove compartment at the time.
Your local Indy?.....Mark at Northants Alfa in Wellingboro'?