"Does that say a lot about what the true reality of "remote working" is like... these guys sell the network but don't appear to be able to make such office linking work themselves."
For those who must be in the office, it's still cheaper to have 150 people in one building than to have 50 in each of three buildings. I'm more surprised this didn't happen much sooner. There's still a lot of legacy duplication since the NTL/Telewest merger/takeover. Likely there are still legacy offices from the original cable franchises. Locally, we have two separate sales offices in two separate cities less than 15 miles apart. I'm rather surprised they weren't merged years ago.