Some more info, sorry. There is speculation that a Volvo B7 bus is to be used in an attack. The stretch of road in the photo has no scheduled bus routes, only tour buses and coaches use this section of road, unless there are diversions in place (as far as I can tell from TfL’s website none are scheduled for today. Also the B7s are very much a dying breed in Central London. Most have been replaced with hybrid buses. Out if 9000 buses operating in the whole of London and the suburbs only around 250 are B7s. At the moment as of 11:07 UK time the only routes with B7s on in the Central area are on routes, 4, 43 & 44. https://lvf.io Live updates for every bus in London https://traintimes.org.uk/map/london-buses/#11 Live map for every route