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The 'NLS Historic OS' layer, which is only available to supporters, is now back. Thanks to Chris Mac for alerting us to its temporary disappearance.
This layer consists of UK Ordnance Survey Historical Maps from 1919-1947 and was put together by National Library of Scotland. Here's a sample:
It can often be useful if you're investigating things like old railway lines or just seeing how things have changed in an area over time.