Hi Dickybird
Its a 1950 ish colchester master lathe used as a 4 axis mill . X is the cross slide, Y is the vertical slide and Z is the top slide.
The 4th axis A is a rotary table which can be unplugged and a vice fitted instead.
The vertical slide and rotary table can be taken off and sustituted for the original toolpost and then I can use it as a Mach 3 lathe.
Graham