The theory is that clusters form around “anchor tenants”; Cambridge has the University (and its excellent CS departments), ARM and some others, and is close to he largest capital marketplaces in the world, grandiosely bundled into a so-called “silicon fen”. So school leavers can get jobs, network, start companies, develop other tech in a virtuous circle.

Well that’s the theory; nobody has actually been able to reproduce Silicon Valley except arguably in SF (it’s more like the valley grew a tentacle is the peninsula, though the distance is far enough that the culture is slightly different).

As far as Cambridge goes, I don’t see that this purchase makes any difference for those factors, except bragging rights in Whitehall.