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You would need to check with the station staff, but I think you might possibly be OK at the extreme ends of the platforms. Anywhere near the middle of the platforms, and a tripod would be a trip hazard on what is a very busy station.
I've seen enthusiasts with tripods there before and platform wise, I suggest the far end of platform 2 (towards Brum/Cov). The station staff are all very friendly and I doubt you'll have a problem.