Crouch Hill Park Skatepark
This is a simple metal mini ramp nestled in the trees on the Parkland Walk, between Highgate and Finsbury Park. The ramp can be accessed from Crouch Hill Community Park via some steps down the embankment. The ramp seems in pretty good condition, although you might have to clean off the seeds and leaves occasionally. Also worth noting that the Parkland Walk can be quite busy on nice day.