We're closed Monday 4th of June - it's a bank holiday.
DBS buildings have the following opening schedules for the weekend
8:00 am to 6:00 pm ,
Sun 3rd and Mon 4th
Castle House Sat 2nd, Sun 3rd & Mon 4th
8:00 am to 6:00 pm
Balfe Street & Bow Lane
Image source https://twitter.com/uniofgreenwich/status/337958122029207552