I would be interested in this too, not specifically this car but just a good recommended company who refurbishes diesel high pressure pumps and what sort of cost to expect to pay?
Shafttech or carwoods may be able to help. Pop in your local Parts Alliance as they have a contract with them even your local Euros should have a suppiler to recon a fuel pump.
Thou cost wise it may be worthwhile with the prices of new pumps