Sorry you haven't had a response in such as long time but- The delivery method of your master’s is not added to your degree certificate. You will receive the same certificate as a student who studied full-time on-campus. And just like an on-campus student, you will be invited to a graduation ceremony in London so you can celebrate your achievement. (source- KCL Online masters FAQs https://www.kcl.ac.uk/online/applications )