So after the Battle of Copenhagen, the Danes decided that they needed lots of naval timber for their new huge fleet, so they planted it. Alas, it only reached maturity in the 1980s… which is why there was a lot of cheap paper about then.
And the Great Hall of Trinity has a very impressive roof, with huge beams to hold it up; but they were starting to fail. So they looked around, and soon discovered that there wasn’t anywhere that could sell them timber large enough. Hmm. Aha, says someone, we seem to have a college forester (since as a large old Cambridge college they have land holdings all over the place); perhaps we should ask him. Indeed: his records show that this particular grove of trees was dedicated to the task of being the new Great Hall beams when it was planted.