One big sprawling station for underground, overground, dlr and mainline. So many Connections, if you can find them. Also listed as Stratford Underground and DLR station.
The high speed Javelin trains to St Pancras and Kent, are located at Stratford International Station. Either one stop north on the DLR or a few minutes walk through Westfield shopping centre
There are in effect two separate sets of DLR platforms at different ends of the station. If you don't realise that, it's 50/50 whether you'll end up on the right platform!!
If the main ticket machines are busy, bear in mind there's a lone machine across the concourse by the Jubilee Line platforms that tends to be free, even at rush hour.
It's easier to find Platform 9 3/4 than get from the high speed international station to the tube, especially late at night. Too many old parts cobbled together makes it awful to navigate.
The toilets just behind the barriers as you enter from the bus station have now been closed due to vandalism. Use toilets in Westfield (free) or Stratford Centre (chargeable).