If anyone has been trying to access the BL website and been stymied (like me), it's because it was hit by a cyberattack and will be down for several weeks. According to this tweet by the British Library,
We have now confirmed that this was a ransomware attack, by a group known for such criminal activity. As mentioned in previous updates, we’ve taken targeted protective measures to ensure the integrity of our systems, and we’re undertaking a forensic investigation with the support of NCSC, the Metropolitan Police and cybersecurity specialists.
The library is open, however, and their other ancillary sites (like the shop) are working. They have also set up a separate site for now with upcoming events and other information: https://britishlibrary.typepad.co.uk/living-knowledge/2023/11/british-library-events-.html
Such a shame that something like this would happen to such a worthwhile place.