It's true that there isn't a direct correlation between technology clusters like Silicon Valley, and it's overspill, the Oxford-Cambridge biosciences technology parks to transport infrastructure.But it is better in northern England compared to the south, yet the south (even far from London) has a stronger economy. Merseyside in particular is saturated with motorways and has a half decent urban rail network yet it is one of the poorest areas of Europe. Travelling around Cambridge is very difficult but has a very strong economy. There seems to be not much correlation between transport and economy.
Silicon Valley was mostly desert, they built it out of nothing. But these are national economic strategies that have taken decades and cost trillions of dollars in real terms and are concentrated around certain educational institutes and labs - Caltech, Stanford, University of California, Lawrence Livermore National Laboratory. Here, Oxford and Cambridge.
There are also heavily concentrated into relatively small areas. There is no equivalent national strategy for Northern England, so it's comparing apples and oranges, so it ends up being misleading.
The new 'technology' economy is more mixed in northern England, but is still centered on engineering, both at the university level and in industry. In that economy, people still need to commute fair distances.
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