The 200tdi type are definately different to the 300tdi I bought some from craddocks a couple of years ago, I,m sure they will still sell them, can,t recall how much they were tho. (couldnt have been too much as im a cheap skate)
IIRC you can,t get them tested in local specialists as the presure is too high for them to check the second stage of operation, but that was a couple of years ago
Gaz