From Govt website: The major difference between the status British citizen and British subject is that British citizens are able to travel freely within the European Union whereas British subjects who are not European nationals for passport purposes, may need to obtain visas prior to travel. Individuals holding "British Subject" passports may be required by the immigration laws of the receiving country to obtain visas prior to travel. This is not a matter over which the British Government have any authority to intervene. The UK Passport Service therefore recommends that all travellers check with the travel agent or the embassy, high commission or consulate of the country they intend to visit if a visa is required.
