I have a leaking wall mounted bathroom tap

[MattSG]

I have a wall mounted bathroom tap that leaks. Presumably I need a washer of sorts replaced. I cannot work out which tool I need to remove the tap. There is a small hole (8mm?) to the side but I can’t seem to get a fixing from either a alum key or screwdriver. Ever hopeful…?
Matt

 

[SimonG]

Picture paints a thousand words. Do you know the make?

 

[Lou]

Yeah can you post a photo and tell us the make?