Exactly what happened where I work, too many people employed wanting to be in London and not enough office space. Moved to a system where you have to book a desk to work and we were told if you can do your job from home then please do.
Works fine with me and to be honest had I still had to have...
WFH four out of 5 days a week now as prefer it to the daily commute grind to London.
Pace yourself I start early, finish after then when in the office but far more productive in my view.