In 2013 the British Museum hosted an exhibition of Ice Age Art. All the works on display were older than 20,000 years, and all art is the product of the structure and organisation of the modern brain.
From the British Museum web site:
"Through archaeological evidence from Southern Africa, we can ascertain that the modern brain emerged just over 100,000 years ago with the appearance of art and complex behavior patterns. This exhibition will demonstrate how the creators of the work on display had brains that had the capacity to express themselves symbolically through art and music."
https://www.britishmuseum.org/about_us/news_and_press/press_releases/2012/ice_age_art.aspx
The British Museum is rather venerated in the Org with Society approved tours - pretty sure this exhibit (like plenty of other items on display) would have been off the itinerary. Maybe they tried to hide it behind a sign saying 'Beware of Leopard'.