hello mate, chord use mk plugs for the lower priced made up cables and I think schurter iec connectors, they don't look to be plated just the standard brass, the top end ones use furutech plugs and iec's, if you want matching terminations on each end of your cables then there is the very best IMO of course Furutech FI-1363 mains plug, rhodium plated or gold plated, then the other end is FI-11 IEC connector gold or rhodium plated, that would cost a pretty penny for 4 sets mind you, the rhodium mains plug costs nearly £100 just for one.
A silver plated mk toughplug is probably a sensible option as its relatively easy to wire up yourself (if in doubt ALWAYS consult your electrician before wiring anything yourself) and the best connector for sensible money is the Wattgate 320i silver plated, they are cryo treated at the wattgate factory now as standard, the next step above is the 350i AG which is triple silver plated at the wattgate factory hence the AG at the end meaning audio grade, most customers tell me the 320i silver plated is a good performer.
Below that but still a good budget performer is the Martin Kaiser IEC (same as RA uses), I silver plate these as well, there is a matching mains plug for that one, budget wise you have 3 options there that will all improve over basic un-treated brass connectors and plugs, improvements based on customer feedbacks.
Hope that helps, I forgot to mention a useful addition are ferrite clamps/rings which help to combat the RFI around your cables which is caused mainly by wireless internet which uses radio waves, your cables act as aerials to pick up all that mess and transmit it through your entire system!
Figure 8 connectors, finally there is an audiophile grade one out that you can wire yourself very easily, courtesy of Furutech FI-8N, apart from that you have to solder one on yourself and its not easy unless you are good with a soldering iron!