As laranna said, I would say References supplied on request and if they ask you then present them as you suggested

Name
Number
Previous working relationship
Company
Role

I think it depends on the feel you get from the interview as to if you discuss the expressing or not. If you are feeling good and comfortable and you have discussed that you left your last job to have a baby, you might bring it up. Simply ask if there is a place that would be suitable to express and store milk. If you aren't feeling comfortable then you might not want to discuss it at that point.

Also I would ask what the recruitment process is from here eg. will there be another interview, when are they likely to make a decision.

Good Luck with the interview!!