Hi Richard,
that depends on your Brake system.
There are 2 different types - Bendix & Lucas Girling.
To identify you have to have a closer look behind one of your front wheels.
The Bendix system slides "freely" and is hold in place by a Pin on each side.
The Lucas system is bolted on with 2 screws.
I did a quick search for pictures.
#1 (left) - Lucas Girling
#2 (right) - System Bendix
HTH
David