https://www.bbc.com/news/uk-62123886
In the documentary, barrister Alan Briddock tells Sir Mo his nationality was technically "obtained by fraud or misrepresentations".
Legally, the government can remove a person's British nationality if their citizenship was obtained through fraud.
However, Mr Briddock explains the risk of this in Sir Mo's case is low.
In a case like this there should not be any possible repercussions, Sir Mo is the victim here and the law should be solidly on his side and not have to rely on the kindness of some civil servant choosing not to remove his citizenship.
EDIT: The Home Office says "“No action whatsoever will be taken against Sir Mo and to suggest otherwise is wrong,” a spokesperson said."