40 years since my last visit! Free entry and 4 hours to fill before flying out found me struggling to see every exhibit. Five floors and probably needed 8 hours to give it justice. Midweek place was fairly busy but very noisy with lots of schoolkids doing history projects. Thankfully less noise in the Holocaust gallery which is a place of reflection and a must see. Managed WW1 & WW11 floors and a coffee stop on the ground floor in my allotted time...scheduled for a return next time in London.