Sump nut washers on Defender 300tdi

Hi all
Just got me a Defender 90 300tdi {selling my Disco td5 if anyones up for one ].
I am looking to change the engine oil, and have noticed that some service kits come with an ally and a copper sump nut washer.
Do I need both, which order do they go on ?
I have looked through other posts but can find no reference.

Or am I completely wrong?

thanks all
Ray

only use one or the other..

just replace whatever is there when ya take sump plug out...

whatever you took off replace it with the same kind