There are various temporary passenger flow arrangements brought into use at Custom House when there are substantial trade shows at the adjacent Excel centre. When the shows are ending the normal DLR platform entrance, for example, is blocked off with barriers (thus also preventing the alternative walking route to the secondary EL gates as well), and those going into the DLR, including transfers from the EL, are sent by a secondary (and unsignposted) walkway route on the opposite side of the approach concourse which snakes around and eventually goes down to the DLR platform. Quite what this actually achieves I have never understood, it means that DLR passengers now have to walk head-on through the departing Excel crowds.
The escalator usage at the station is bizarre, with the two upwards escalators from the DLR for the "problem" connecting route to the EL being the only ones for DLR usage - all other access is by steps. Meanwhile, from the higher level EL concourse the fixed signage pointing down to the EL platform has, since opening day, pointed down the escalator coming in the opposite direction, upwards. The downwards escalator is further along, unsignposted. Any safety audit would have spotted this in a flash, but it's been like this since EL opening day a year ago.