Depends how you say it. The base cost replaces a server's cost. Does then £2.50pcm per £2000 pcm staff member make it sound better? I've known remote access solutions that cost more, although admittedly this is only really SIMS remote access even with the Excel and Word access within the hybrid cloud environment. Could be competitive if you can find some glue and spare letters for the missing keyboard keys on those vintage laptops.
On the other hand, if you've got a working server and remote access to the network for senior leaders, maybe SIMS Teacher App? It lets teachers assess offsite at least, and do registers and conduct including offline.