Hi Kevin,
thanks for the replies.
So far I know they are quite big smooth, polished tiles. I will try and find some more info out. I know they the receptionist there but she will not be back in until the weekend, I will ask her to take some photos for me.
The current cleaners dry mop it in a morning and wet mop it on a night, but when I went to have a look it was raining and it was like an ice rink, so I would be really concerned about wet mopping it as it needs to be cleaned whilst open.
thanks
Ange