I have resolved the removal of the CV joint and I had to remove the shaft to do it. I found it impossible to restrain the shaft sufficiently to enable reaction to a sharp blow to the joint to free it whilst still on the car. Initially I was going to follow the guidance of the Hayne's workshop manual in the removal of the right hand shaft; this involved draining the transmission oil, slackening and rotating through 90 degrees the two bolts that retain the intermediate bearing and then simply pull on the inner end of the shaft to free the intermediate bearing from its mounting and withdraw the shaft from the transmission. Shades of "YOU CANNOT BE SERIOUS!" came to mind. The intermediate bearing was well and truly "supported" and would have needed some serious effort to persuade it to part company. I was pleased that I hadn't drained the transmission oil because it became obvious that the outer section of the shaft was only retained by the large diameter gaiter clip on the inner joint housing! Remove the clip and the outer shaft springs out at you! OK so you get a mess of grease that surrounds the inner universal joint with it but hey...compared with working through the Hayne's book it's a doddle. Once off the car and held in a vice, the CV joint responded to a heavy hammer blow to the inner part and replacement was equally simple. It is now all re-assembled. I bought the CV joint on line from J&R Trading in Birmingham. The cost was £13.33 plus p&p £4.16 plus VAT which brought it to £20.99, still a good deal! So a good introduction to the Xantia that will hold me in good stead for the next project...a fuel leak from the front face of the fuel tank which is probably related to the fuel pump that I hear when I first turn the key. Wish me luck!