TfL (Transport for London) will be issuing periodic updates beyond the weekend closure news I’ve been posting. I’ll be including these links along with the regular Tube closure postings as I get them.
This new series of announcements relates to accessibility issues. TfL has provided a ton of information on this topic on their website, not least of which is a map and legend showing where ramps are available, as well as the size of the gap at various stations. The Tube has a long way to go before the entire system is completely accessible for all, but if this sort of access is essential for your visit, this information can help you to plot your route/s.
Note that there are many more maps, pdfs and such once you’re on the website than I’ve linked to above. Homework!