As someone interested in local history then census information is really important for future historians. No one will be allowed to see personal information for at least 100 years.
However, it is also important that everyone completes the census to try and make sure that areas such as Newham get future Government funding according to its actual social and economic need.
It is of course also the law of the land to complete but please do the right thing and fill it out.
Census officers will visit and knock on the doors (repeatability) of all dwellings who have not completed.