The air to air refuelling system on the Nimrod was installed after the Falklands, so it's not as old as the airframe.
I'm not suggesting for a moment it is safe. That's for the enquiry. I worked on the weapons system of the Nimrod with the prototype installation at the time of the Falklands, and it always stunk of fuel, but so did the Lightning.
You cannot keep doing things on the cheap and not expect to pay for it eventually.
Unfortunately those paying the price are not the penny pinching bean counters.