Been doing loads of digging around on the car and the internet, am I correct in thinking the slave cylinder is a "concentric slave cylinder" ??. If that is the case I now understand how it works, and as Bob points out why you have to remove the engine to change it. I havnt done this for many years when slave cylinders were a simple piston type that pushed a lever.
If someone can confirm if I am correct that would help enormously.
Thanks
Chris