I got hold of a Stein Tekichu (not-a-bigshot) and was finally able to get up the biggest redwood in Ashclyst. After an hour of trying (!) I isolated a limb 22m up (my doubled rope didn’t reach the floor when I clipped in), and then I climbed, I reckon, another 8 or 10 metres to the top.
From which you can see the sea.
Thanks to Mike Gozna for the gear.