Why would the tier number apply to the Ricoh? Surely it should apply to where each supporter calls home.
So, people from, say, Coventry (tier 3) cannot go but those from, say, Bucks (tier 1) can attend.
In my case, I drive to the Ricoh nonstop, watch the game, wander back to where I think I left the car (car park C) and go straight home.