there is a connector behind the front drivers side wheel arch protector. The pipe runs behind the petrol tank, awkward but accessible and then has 90deg. bend at the rear of the drivers side air spring and a straight run along the chassis up to the connector. The pipework from the modulator to the connector will be corrosion free and should be ok.
If you are replacing it yourself, buy some new M10 fine thread tube nuts from Ebay (Short type) and a coil of 3/16" dia. copper brake tubing (Around £15). Also you will need a flaring kit and preferably a small hand bending tool which will give sharp accurate bends and reduce the possibility of kinking the pipe.
Get under the car and you should be able to follow the run of the existing pipe.