One of the projects I have finished recently was located at Amigo North - staff restaurant at Heathrow Airport - Terminal 5. It was a total refit of the restaurant design including new counter, decorations, building new storage room, new installation, etc.
The project was done together with Barden Facility Management Ltd and GS Site Services Ltd. Barden FM was responsible for all installation modifications - electrical, plumbing, refrigeration, lights, etc.
Scope of works is pretty wide and complicated, that's why was necessary to prepare proper drawings for engineers working on-site. The crucial point was to show what needs to be changed, when and how in a simple, understandable for installers way.
I was managing this project personally.