It’s been mentioned on here before but I had today an email announcing tickets now available:
“London Museum opens its new home in Smithfield on Saturday 28 November 2026, with free general admission tickets available to book online today.”
“Tickets are available through to the end of December, with a limited number of walk-up tickets each day.”
Admission is free. Tickets are no cost. But they are using a timed entry system at least initially.
https://www.londonmuseum.org.uk/whats-on/smithfield-general-admission/
The previous version was a great introduction to the history etc. of this wonderful city. Looking forward to this new one!