Look in the manual.
On p. E3 regarding fuses.
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Just opened up the fuse slot in the XPS DR - the fuse had blown up ! Have now extracted the bits of blown fuse - where does the spare fuse go?
The spare goes where the other was. There are two fuse slots, the one farther in is the live one that blew, the one farther should contain the spare. Slide the spare out and put it into the other slot.
Then make sure that the power cable is fully inserted. A lose cable can arc and blow the fuse.
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I have never replaced a fuse on my XPS-DR. My understanding is that there are two fuses, one working and a spare. If the working one stops working the spare is used. If you removed the non-working fuse, was there a spare?
My understanding is Naim recommends only using fuses provided by Naim and if you do not have a spare then connect a dealer for replacement.
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Thanks everyone - is this the right place I’ve put the spare? Can seem to close the slot now - don’t want to force it
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Looks fine as far as I can tell. There are really only two places where the fuse can go 
Make sure the fuse is not too high or too low in the slot. It does take a bit of a push to close the holder, but not much force. If it doesn’t go in, the fuse is probably too high or too low
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The Powerline can arc if not fully inserted and this can blow the internal fuse. It can put up a lot of resistance due to the tightness of the jaws, making you think it’s in when it’s not. See here…
https://community.naimaudio.com/t/how-to-ensure-your-powerline-is-properly-connected/7997/2
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Thanks Richard
So it turned out I hadn’t got all the blown bits of fuse out which is why the fuse compartment wasn’t closing . It’s powering on now so hopefully it’ll be ok. Now onto the NDX….
What are you powering from the XPS ?
The NDX - I plugged a mains cable in and no power but the blanking plug wasn’t in so maybe this is why - just about to check …
Ah yes, it won’t power up correctly without the link plug in place.
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The NDX is working !!! Thanks very much everyone , this forum is fantastic, great community 
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Why did fuse blow?
I plugged a power line in but had forgotten to switch the XPS off on the front panel. Think that was the reason .
Bet u won’t do that again 
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I certainly won’t
XPSs had a bit of a reputation for blowing fuses, though it never happened to me when I had one. Time to get a proper (Naim approved) replacement fuse for the spare slot I would suggest.
Roger
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Thanks Roger, yes absolutely.