What will happen if you don't pay a 50 thousand British visa and don't come back

Repatriation to China. According to the regulations in the Measures for the Administration of China Citizens' Traveling Abroad, tourists are prohibited from staying abroad, and those who stay illegally will be repatriated if they don't come back within the validity period of their visas, including the phenomenon that 50,000 visas to Britain don't come back. Visa is a kind of license issued by a government agency according to its own laws for foreigners applying for entry, exit or transit.