Bit of a challenge, this NOTAM ...
"OXFORD JOHN RADCLIFFE HOSPITAL. 3 CRANES ADJACENT TO SITE.
ALL HEL TO CALL HOSPITAL SWITCHBOARD BEFORE USE TO ENSURE CRANE JIBS
NOT OBSTRUCTING HEL LDG SITE."
Now, how long before the local schoolboys start showing off to the girlies by phoning up on their mobes, pretending to be helicopter pilots, and watching the cranes move out of the way out of the classroom window?