GSA Office and Bar will be back to official scheduled times effective from September 1st 2015. GSA Office will be open from Monday to Thursday 10:00 AM – 2:00 PM. Windsor Castle Bar will be open on Monday, Tuesday & Wednesday from 3:00pm – 10:00pm, Thursday: 3:00pm – 11:00pm and Friday: 12:00pm – 12am. Saturday & Sunday: Closed. Thank you for your understanding!.