Are they guaranteed to have them? I have already had problems up to
_here_ getting plans of the flat when the engineer came to survey the
wall I wanted to remove. He said if there were plans it would be a lot
easier, rather than go around looking for clues. The "management"
company (who required the engineer in the first place) was useless -
"We didn't get any plans from the builders".

Eventually he poked up through a ventilation duct and hit the concrete.
I was most displeased when he told me that of course it would be fine
as the building was of concrete construction as long as I didn't knock
through any concrete (as if!). Did the fricking management company not
know that already? In a building with around 100 flats, I doubt I'm
the first person to remove a wall.

Anyway I'll do some more research and post my findings.