Apparently its called Knopper Gall, and is cause by the tiny gall wasp Andricus quercuscalicis. It can affect a high proportion of acorns in one year, and almost none the next. Apparently it is unlikely that it will pose any threat to the future of the oak, since most acorns are destined to be food for something rather than turning into trees. I hope it won't harm the squirrels! Further along the walk some of the older Oaks in the ancient tree belt are thankfully unaffected.
The Sloe bushes are looking distinctly poorly this year as well. The leaves are very small and shriveled. The cause is definitely not through lack of water we've had more than enough rain this year. The fruits are ripening but are very sparse. These bushes are usually loaded with fruits.
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