Hi Folks,
Thanks for the replies.
Nope, I did not see a planning notice. It would presumably have been at entrance to the office park, which is not on my road.
I'd better brave the planning office again. The file is massive! there were tons of objections and revisions. During my first visit, I did not notice details like a roof terrace or screen, just felt panicked and sick that the thing was happening at all.
I guess a lesson would be to take the odd trip to the planning office even without seeing any signs, just as a precaution!