Can you use a laptop on British airways?

Answer 1

Yes, of course. You can use laptops on any airline. But only during the flight, after the plane has reached cruising altitude, and the flight attendants have announced that it's "OK to begin using approved electronic devices" (laptops, Video Games, MP3 players, etc.). You cannot use any electronic device during take-off or landing. If you do, it's no big deal, but the flight attendant will tell you to put it away, and you'd better do so if they ask. If you disobey any command they give you, you're breaking Federal Law.

Answer 2

Yes you can use your laptop, but not during take-offs and landings and when the captain or flight attendants announce that it's ok to use electronic devices.
In seat power depends on the class of travel you're flying and the plane you're on. In 1st class, Club World or World Traveler Plus you most likely will have in-seat power. If you're in the regular World Traveler class, you won't have in-seat power ports.