If you are certain of the identity of the person that the closed record relates to and they are dead, you can apply for it to be opened. If you are a FindMyPast subscriber, you can do it for free via the link on their site when viewing the page image, called "Open closed record" or similar. You will need to upload a copy of the appropriate death certificate and state your connection to the person. Alternatively, you can request opening of the record through the National Archives, but there is a fee in that case. With the recent opening of the 1921 census on FindMyPast and their continuing work to correct transcriptions, I wouldn't hold your breath over how long it might take though.
