Happened to me last summer, it was announced around this time last year too to staff and parents on the same afternoon, the predicted numbers coming into lower and senior years just made no financial sense to continue, think we were one of the first to blame the incoming 20%, although the nursery was exceptional and always full. I had a very busy end of year and summer wiping devices for students and the school. Also the student numbers will probably plunge now before the end of the school year as parents shift their kids to other schools as soon as they can with other independent schools offering free places until September as an incentive, we ended up with one class with 4 kids in by the end. The younger ones were more resilient but the senior kids took it hard and it effected them a lot even the the Year 11s taking exams. Other stuff to get sort is exams, what happens with results and also challenges to exam results as this will be beyond the closure date, someone will have to be there for this.
I was there until the final day working in August in a very empty school until security threw me out, expect teachers to want to take every resource they can with them and if your getting administrators in then they'll potentially be a few bargains to be negotiated on if you want anything. I ended up with few things including a 65" tv for very little. I was also very lucky that I found a new role very quickly via friends and walked straight into it on the inset in September.