When we got new phones in July last year, O2 were offering a deal whereby you got 100G pcm for £20.
Unless you are doing what you are wanting to do, that amount of data is stupid, the last time I metered it (read cared about such things) we only used ~50G pcm on the home broadband, which covers 2 adults and 1 teen, Netflix/Prime/Disney+ Work and other stuffs so each of us having 100G is beyond ridiculous!
Might be worth a) checking on who has the best data coverage where you will be working remotely and b) then what is the best data offer, taking into account MVNO (Tesco, Asda, Giff Gaff etc who don't have a network themselves but piggyback off others) on that network.