Yeah, you can work from home whenever, so long as you're generally in the office for core hours on weekdays, or let people know that you're going to be out. Eg

Yeah, you can work from home whenever, so long as you're generally in the office for core hours on weekdays, or let people know that you're going to be out. Eg, I wanted to go camping Fri-Sun, so I worked a few hours on the previous weekends.