2.0L Diesel DPF issue

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I have the above engine in my Skoda Superb, 140hp, 57 plate, 83K miles. I have been getting the glow plug warning light issue, which has been diagnosed as a DPF issue. I have been told that the DPF needs to be refilled, at a cost of around £400, this is from an independant. I am told that the MK1 Superb had this type of DPF, which was changed to a solid state type on the MK2.
Has anyone had this issue on a Superb, Octavia, Passat, Golf, Bora, A4, A6 etc etc, and is the only option to refill the unit, can it be swapped out with a used unit from a scrapper.
If anyone has had this done in the Staffs, North Midlands area, could they recommend a specialist who would be competent enough to do the work?
Thanks for reading.

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Cheers Cuprabob, what you are saying does ring true as my garage has said that the unit is located under the boot and is accessed though the spare wheel well, so not by the engine at all on this vehicle, and from what i have read elsewhere i see that around 80K is the cutt off point for this needing to be done, however your quote is substancially less than the quote i had from a non specialist garage, at £450, obviously shopping around is called for.

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Cheers Guys for the input.
Today i took the car to a VAG specialist in Cannock, who plugged the car into their reader, and informed me that they had never seen this type of DPF filter on a VAG vehicle previously, the guy even looked on the net to find that the MK1 Superb is the only VAG group vehicle to be fitted with this type of system, apparently the system is pressurised, and can only be corrected by a Skoda dealer. so i am off to the dealer on thursday to find out how much i am in for