I am going to the Albert Hall on Sunday with my daughter, and I'm trying to gauge how long it will take for us (walking & tube) to get back to Liverpool Street Station to get our train back to Norwich. The concert is predicted to finish at 9.45pm, and our train leaves at 10.30pm. The online travel advice suggests a 15 min. walk followed by approx 30 min. tube journey. I am thinking we should leave the concert early, as really worried we'll get stuck. Do any of you seasoned commuters/tube travellers have any tips/think this journey time is pretty accurate?