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Parts required just to re-seat the injectors are - copper seats, plastic seals and new hold-down bolts. As I said above, my local diesel enthusiast did the job for £120. Garage mechanics will tell you that the best way to clear the black gunge is to spray with Mr Muscle oven cleaner, leave overnight, then blast away with an air line.The seats in the cylinder head may be burnt and may need cleaning-up with the seat-cutter tool.
Two local garages refused to do an injector job, saying that if one or more injectors were stuck, they would have to call in the local diesel specialist with the expensive hydraulic puller tools, and that I would be better to take the car to the specialist (which is what you should do rather than take it to Ford, because the Ford dealer is likely to take it to the local diesel specialist then charge you twice what the specialist charges them). But I hear that on this engine, there's more chance of the injectors coming loose than of them sticking.
If Ford want £400 for parts, are they pricing in a new air-box, if you say that the air box may be damaged by the hot gasses? Can the air-box not be repaired? Perhaps you could source one from a breaker or even e-Bay.
One problem that you may find is that with all the plastic on top of and around the engine, some of the screws threaded into the plastic will strip the thread. This is because plastic deteriorates with age and with the temperature extremes in an engine bay, it deteriorates even faster. It won't be you being ham-fisted, it's just the way it is. If it happens, drill 'em out and fit a plas-plug.
Four 'unnered quid? Nay lad, nay.
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