It's money partly I would think, in two senses. The upgrades themselves would be expensive as hell, and since the BRDC (or anyone else who ran the place) would need to run Silverstone at a profit given the lack of public subsidies, it may not be practical to do the upgrades at all (upon detailed analysis, which always comes later it seems).
My point would by, what specifically NEEDS upgrading at Silverstone; nothing as far as I'm concerned and can actually tell.
Kind of OT, but it occurs to me that if they keep doing these glorified parking lots for F1 circuits they're going to run into some royal drainage problems eventually.
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