Access between congress venues on the Queen Mary University of London site is step-free and the entire campus is disability friendly. See http://www.dds.qmul.ac.uk/disability/ about QMUL buildings. London buses mostly have ramps for step-free access. Many tube stations have lots of stairs and no lifts/elevators, so it is best to check with https://tfl.gov.uk/transport-accessibility/ as you plan your travels. Taxis on the street are plentiful. Email or message Anthony Bale if you have more specific questions: firstname.lastname@example.org.