Which ship are you taking for your BIE cruise? Quite a few of Viking ships port stop have been moved to Tilbury, even though Viking still lists Greenwich in all their material, Tilbury is past Greenwich, and closer to the mouth of the Thames River, in an industrial area. I'm putting links to the port schedules for Greenwich and Tilbury for May 2023 below.
We're on Viking Venus a month after you. I've read that Tilbury is an industrial area with nothing interesting nearby. Was looking forward to being in Greenwich for two days.
Not sure what to believe, Viking sales material or the British published cruise port schedule.
London-Greenwich (England) cruise port schedule | CruiseMapper
London-Tilbury (England) cruise port schedule | CruiseMapper
Tim