The fitting is of an incredibly simple construction - the supply cable terminates directly into the lampholder, and the earth connection is made via a screw that secures into the aluminium body. The side entry spigot carries a 20 mm female conduit thread; a small slotted grub screw then secures the fitting to the bracket. Best of all is that the fitting proudly claims its British manufacture - no foreign junk here with which to contend!

When assembled, the fitting's 1970s' heritage is obvious - I'm not quite sure what colour the body is painted (officially), but it's probably not a colour that would be considered particularly fashionable these days! Interestingly, along with filament lamps, the bulkhead can also run 80 Watt and 125 Watt MBF lamps (once the lampholder is changed).