Depends, if you have a look under your brake pedal, if it looks like the one in your picture you don't need the modified loom. If it looks like a mini asthma inhaler then you will.
To remove you need to unplug the Loom and twist the switch to remove. To fit the new one, press the brake pedal down with one hand and twist the new switch in (line up the hole with the 2 prongs on the switch). Once fitted, release the brake pedal and you'll hear some clicking as the plunger sets itself. Plug the Loom in and hopefully problem solved. Access is tricky and you won't have great access to see what you're doing so you'll have to feel your way around a little bit.