a fused spur would be you wiring it in directly to the mains without a plug [using a fuse for obvious reasons] and a plug is well using a plug to do the same thing with the fuse in the plug
A spur means it comes from the main ring in one direction but that is not important – a plugged in item is essentially a spur for this example
My guess the lights/fuse is broken
Plug then in somewhere else [ not on the same ring] and see if they work
Change the fuse in the plug next if still not working
If they dont work then possibly the bulb or broken light fitting but return time
if they work elsewhere but not in your socket then it is the socket/ring that is the issue
I am not an electrician and it is dangerous and whatever other legal caveats I need to say it is your risk etc.