I got the new swicth from Maplin, the packaging has a code NO6AR

 

I got the new swicth from Maplin, the packaging has a code NO6AR

Probably just a date code..

Look at the datasheet..get out your meter (resistance) and figure it out.. "You can do it"
Its a simple device but as a beginner make a chart with each pin and its resistance (or continuity) to the others.. Then look at the datasheet and figure out which one you have..

The diode check is only gonna tell you which side is the cathode/anode if the pins aren't clearly marked on the switch.
More than likely its just 2 terminals for the switch (in/out) and 2 for the LED (+/-) and no connection between LED terminals and actual switch terminals
Use ohms law to determine the proper resistance (and wattage) for the resistor based on the supply voltage and have fun.. Multiple the required wattage by 2 for a safety factor.. You never want a 1W resister dissipating 1W.. Most requirements in the real world require 2 (some even 3 times) the required wattage.