Made a good half a dozen visits to heathrow tower in the 70s...always warmly received and learnt a bit which changed BEAs RT.
On initial contact with departures we used to go through the whole card with clearance ..blah blah blah...discovered the controllers worked the same screen and asked what they needed.
Bea line 247 passing 3.6.
Good morning Bealine 247 radar identified continue as cleared.
Got a huge rollicking from the skipper but explained why three calls were unnecessary and the word spread.
Similarly flying with the Swiss used to fly underneath the Biggin stack at VNE until we recieved climb clearance.
Just needed to ask " do you have any specific speed restrictions".
Great bunch of guys.
During my induction in Zurich we had a day with ATC and similarly on my command course.
Notice my post re landing without clearance in Tripoli has disappeared.
C'est la vie.