Changing a hard to reach basin tap

[gap]

I need to replace a dripping bathroom basin tap. The chrome finish of the taps has seen better days so I''m opting for new taps rather than just a washer.

However, the threaded part of the tap is in a receded part of the sink and behind the pedestal and looks quite difficult to access (i.e. to turn a spanner).

I'm hoping for tips on how to get the old one off and the new one on, without dismantling the basin/pedastal. Photos attached.

 

[gap]

Oh dear, please forgive my ignorance. After some googling it looks like I need one of these.
https://www.screwfix.com/p/adjustab...gclsrc=aw.ds&dclid=CJL1qqun5tYCFVMD0wodpOMJ1g

 

[Nige F]

Or a "tap backnut spanner" AKA box spanner - from Screwfix too

 

[FiremanT]

Or a "tap backnut spanner" AKA box spanner - from Screwfix too

He will still need a tap spanner (adjustable or otherwise) to undo the tap connectors

 

[Nige F]

D'oh

 

[HERTS P&D]

I have one of these

https://www.screwfix.com/p/armeg-jaw-dropper-plumbing-wrench/99190

Andy