Alan,
Can't be specific about the Bantam – the manual for the 5½" misses it out, but the travelling steady is customarily fitted in front of the tool, ie between the tool and the headstock, and usually on the front of the saddle.
As the Colchester steady has "sideways" bolt holes, I should look for a pair of threaded holes on the front edge of the saddle. Unless they have been plugged by a careful user, these will usually be full of gunge.
Phil