The 308 bus says that it stops at “Stratford Centre, Stop E” - but I can’t find it. Google and the APIs seem to think it’s here, but I had a good look around and … no stop E.
But the TfL site puts in in the same place https://tfl.gov.uk/bus/stop/490015114E/stratford-centre?lineId=308
However, it seems that the stop there is Stop K, accoring to the Spider Map - http://content.tfl.gov.uk/bus-route-maps/stratford-a4.pdf
It’s not like I’m usually going to take this bus, as is always quicker to walk. I’m impressed that this acrobatic loop-the-loop is in the data!