Once did a trade show at that place. Start of the day MU customer services come round informing us if anyone wants to take the tour during the two days then we need to book in now and pay upfront.
Day two, they come round again and offer it for free because they had spaces. In our group we had two city fans, one Leeds, one Liverpool and one arsenal. Nobody took up the offer, although I do wonder if I should have done so just to ask where the infamous peeping tom bathrooms were, or where were the houses they chucked the Munich survivors families out of, the freezers with the rancid school meat, or of course the one and only parking space reserved for he who must not ever be sober.