The descent is a long timber staircase with landings, rebuilt periodically as the scarp retreats, and it is a serious carry with beach kit. Going down is fine. Coming up at three in the afternoon in August, with a cooler and a child who has had enough, is the part people remember.
The bigger practical issue is the tide. At Marconi the usable strip between the water and the base of the cliff narrows sharply on a high spring tide, and in places it effectively disappears. That matters if you have walked half a mile along the sand, because the way back can close behind you. Check the tide table before you commit to a long walk in either direction, and keep an eye on the cliff base rather than the horizon.
Do not sit under an overhang, and do not climb the face. The material here is loose glacial sand and gravel with no cohesion, undercut by the sea, and sections come off without noise or warning. The fencing at the top is not about the view.
The beach at the foot of the stairs is wide, clean, unbuilt in both directions and almost supernaturally quiet for a place with a full car park, because the cliff absorbs the noise.