The similarities and dissimilarities I will list are only in my own experience. I will compare lectures in IPAG Business School and lectures at Greenwich University.
Similarities between French lectures and British lectures
A lecture is giving by a lecturer who is one of the teachers of the subject. He is sitting or standing up and give a presentation on a topic. A lecture can allow hundreds of students who are taking the same course to follow a common presentation on a topic. Students are not forced to go to a lecture but it can give many details on an assignment.
They are also some open lectures with some guests, which invites students to know a topic from a professional point of view. Students or teachers need to register for the open lecture.
Dissimilarities between French lectures and British lectures
Computer, book, brain,… in British lectures, you can follow the lesson with anything you want
You can either write in your notebook or type on your computer. You can even attend the course with anything. The British lecturer does not ask students to leave the room if they do not take notes. Lecturers believe that every student has their own method. In my home university, computers are forbidden for the first year and in some courses in the second year.
Students can enter or go out a British lecture anytime
Students feel freer in British lectures, I noticed that the lecturer accept everyone at any time. Few are late, but they enter the lecture and just go sit down. Students can also go out to the restrooms without asking the teacher. In IPAG, you have a schedule to respect, after 5 or 10 minutes late, some lecturers do not accept students in the lecture room. Moreover, they need to go out before or after the lecture, because it can disturb the lecturer.
Students interact more in British lectures
The British lecture will ask many questions to the students, there is more interaction between a teacher and a student. Students are allowed to give facts and ask questions to the lecturer. Whereas, in France, a student can only talk if he does not understand a certain point. Moreover, British lecturers give their contact information (email, phone sometimes) if students have questions.
Many British lecturers post their lecture presentation before or after the lecture
That allow students to do some researches on topics they do not know and follow more details on the topic during the lecture. Even, if you are not going to the lecture, you will still have the presentation. In IPAG, you do not have the presentation, so you have to go to the lecture to understand a topic.
A British lecture lasts one hour
British lectures are shorter than French lectures (one hour compared to one hour twenty): some British lecturers do not finish the presentation of their topic because there is a lot of interaction with the students. In France, the lecture is finished on time and if it has not been finished, the lecturer finishes it during the next course.
Previous tasks are sometimes asked to do before a British lecture
Students have some videos to see or articles to read before some lectures to understand the topic.
British lecturers bring some guest in some lectures. Guests can be some professionals, teachers, students that have done some great things on a topic and are there to talk about it. It gives a more interesting and trustful lecture.
In my opinion, British lectures are more interesting, I learned more things in a subject because they are some videos they post in a portal to see at home. Moreover, as a student, it is better to have choices, to come or not; to take a computer or a notebook; to talk with the teachers or not. I went to all the lectures.