That it's a non-commercial licence is really disappointing, but that's still a little better than nothing…

https://www.ianvisits.co.uk/blog/2020/04/28/british-museum-makes-1-9-million-images-available-for-free/  

The British Museum has revamped its online collections database, making over 1.9 million photos of its collection available for free online under a Creative Commons license.

Under the new agreement the majority of the 1.9 million images are being made available for anyone to use for free under a Creative Commons 4.0 license. Users no longer need to register to use these photographs, and can now download them directly from the British Museum.

Under the terms of the Creative Commons license, you are free to share and adapt the images for non-commercial use, but must include a credit to the British Museum.

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-- 
Owen Blacker, London GB