In reply to RobertHepburn:
> I found oak can be good and sweet chestnuts can have good slab climbs (the often lean a bit on slopes).
I'd completely forgotten about those 'slab' climbs. There were two or three in Kensington Gardens, one of which was a brilliant VS? 4b. It was quite scary near the top because it took you out about 20 feet up above a wide tarmac path. Serious if you fell. Actually, a lot of them would have been quite or very serious if you fell.
The best climb in Kensington Gardens sadly came down in the storm of 87 (along with many others). Amazingly hard 5b+ climbing up to the first bough (v hard in reverse) c. 20 feet. Then a rewarding 'top pitch' of at least 30 feet up the central limb on nothing but bosses (v old stumps of sawn off branches), c. 2a, technically, slightly set back, so in balance. Very exposed. You came down the reverse side on branches, overhanging, very safe, exhilarating.
Best in Knebworth Park is still there. I was quite proud of that. Took me about 5 years to do it
c. HVS 5a solo, but more like E1 solo because of an appalling, potentially ankle-snapping landing on big twisted tree roots on the side of a 'dell'. Could have been as hard as E2 5b. Very good, because it's overhanging above the crux, and fortunately an amazing hidden undercut appears at just the right moment, otherwise you'd have to reverse the very thin crux, v fast, before you fell off. I tried repeating it 5 years later, and had great trouble, and finally re-did it. So only ever did it twice. Fortunately the descent was much easier, kind of strenuous Severe stuff on one side of the tree. There were about 2 other easier routes on the other side of c.HS to VS.