Cases of de facto statelessness have arisen due to historical provisions of British nationality law which created cases where people have had a British passport without right of abode in the United Kingdom. Those with such status who did not have citizenship or residence rights in any other country were effectively stateless despite holding British nationality. Effective April 30, 2003, as part of the 2002 Nationality, Immigration and Asylum Act, the United Kingdom gave most British nationals without any other citizenship the right to register as full British citizens if they wish, thereby resolving most of the British cases of effective statelessness.
Since June 2008, at least three groups of researchers have documented the long-term detention and lack of viable solutions for certain stateless persons in the U.K.
The exact numbers of stateless Roma in the United Kingdom are unavailable.