How do I undo this waste nut, which is in a tight spot?

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Apologies for the grim photo! I need to replace the waste on our bathroom sink, which sits on top of the wooden vanity. To do so, I need to undo the black plastic nut shown in the photo, to remove the waste, but I haven't been able to unscrew this by hand. As you can see space is tight around the nut. Is there something I should do, or a specific tool to use, which will allow me to grip the nut to undo it please? Thanks!
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Apologies for the grim photo! I need to replace the waste on our bathroom sink, which sits on top of the wooden vanity. To do so, I need to undo the black plastic nut shown in the photo, to remove the waste, but I haven't been able to unscrew this by hand.
Because you said the black nut can I check if you meant the black nut (which is a bolt head) in the centre of the chrome bit or the bigger white nut outside of the waste.
 
Need a basin waste box spanner monument do them but cheaper versions available. Think they are described as 46 x 50 mm.
Thank you Exedon!
Because you said the black nut can I check if you meant the black nut (which is a bolt head) in the centre of the chrome bit or the bigger white nut outside of the waste.
The large plastic black nut outside of the waste.
 
Better to remove the basin from the unit.
Fit new waste.
Clean surfaces and re-stick basin to unit.
Cheese wire to cut through the silicone holding basin on to unit.
Thank you dilalio, why would doing it this way be better?
 
Perhaps because if the sink itself is easy enough to remove and refit it saves you buying a tool that you will only need the once.
 
Perhaps because if the sink itself is easy enough to remove and refit it saves you buying a tool that you will only need the once.
Thanks mattylad, that's a reasonable point. With my minimal level of experience, I feel more comfortable paying the £10 or so for the tool, rather than removing the sink.
 
Thank you dilalio, why would doing it this way be better?

Because that's the way it would have been fitted at install.
You will probably struggle to get a new one on and watertight.
It will likely loosen the silicone whilst you are using force to get the waste out and new one back in.
I would remove the basin.
 
If the silicone is old enough (or cheap enough), just twist the waste and it will come off.
 

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