You should be provided with a private room in which to express - absolutely not a toilet! And I don't see any reason why it shouldn't be stored in a fridge, so long as it's sealed and labelled. The Breastfeeding network has a good pdf about breastfeeding and returning to work
Would a locked office or locked staff room be considered a private room?
It says you should have access to secure, clean refrigerators to store breast milk. I work in a restaurant. Would it be OK to store the EBM in the same fridge as food/drink that would go out to a customer or should it be in a seperate fridge?
It also says I need access to clean and wash equipment. Again can this be done in the kitchen sinks or bar sinks?
I used a meeting room with a notice on the door - a locked office would be fine in my view I bought a small beer fridge first time I did it to store at the the time work had only a very full rather unclean fridge kitchen sinks would be fine - although depends how often you are doing it - I was only expressing one and took everything clean and just gave it a quick rinse