How do remove valve?

[Rickys162]

My tap is leaking. Removed the cover but how do I get the valve out?

 

[steadyon]

1. Spanner on the brass hexagon. With handle of hammer pointing forward towards you, push down on handle while stabilising tap.
2. Looks slightly inset, so might require a socket or box spanner.
3. Measure across the flats of the hexagon to get correct size of spanner.

 

[Scott_D]

Socket set might fit