I managed to fly the quarry earlier this week with my mate - quite an interesting place. There’s lots of warning/danger signs, but we were easily able to find a launch zone adjacent to the quarry and got some good video and photos of the structures left behind to nature and graffiti artist. I have also never seen so many people walking their dogs in one place!
The best place to park is the Waterford Heath Nature reserve car park on Vicarage Lane, then its a 10-15 minute walk north east to the Quarry. The quarry is well away from the nature reserve and does not show up on drone assist as a NFZ.