It's a historical fact. It all started In 1533 when King Henry Vlll divorced Catherine of Aragon and married Anne Boleyn. As a result, he was excommunicated by Pope Clement ll who refused to annul the previous marriage. Civil divorce is forbidden in the Catholic Church ( Matt. 19:9; Mark 10:11-12; Luke 16:18; 1 Cor. 7:10-11). See the ECFs on marriage and divorce. Anyway, he decreed the Act of Supremacy in 1534, making the English monarch instead of the pope the head of the Catholic Church in England. He also closed down all the Catholic monastaries. After a brief experiment with Protestantism under his son Edward VI (1547-53) and a brief return to Catholicism under his elder daughter Mary I (1555-58), England officially became Protestant in 1559 under his younger daughter Elizabeth I (1558-1603). Except under the Catholic James II (1685-88), Catholicism remained illegal for the next 232 years. Catholic Christians faithful to the Holy See at Rome and refusing to swear allegiance to the English soveriegn existed mostly in secret congregations centred on the country houses of Catholic peers and gentry. Priests had to be trained and ordained abroad, and on returning to England they were liable to imprisonment. From about 1580 to 1680 they also risked execution, as did those who harboured them. Catholics were also liable to fines for not attending Protestant services (‘recusancy’). About 300 faithful Catholic clergy were martyred. After Catholic worship finally became legal on a permanent basis in 1791, most of the country-house chapels were closed and the missions moved to the nearest towns, following the shifts of population caused by the Industrial Revolution. So Catholic churches in England are now mostly in cities and towns and date from the last two hundred years. Hence, the Anglican Church is not the Catholic Church in England. The bishops who swore allegiance to the English sovereign forfeited their apostolic lineage. All ordinations have been invalid ever since. Meanwhile, in the complexity of the outgrowth of all the different branches in Anglicanism, most ancient apostolic traditions have been lost, including the Marian traditions. What you are left with is some borrowed Catholic capital which includes the Bible.
It all started with Henry. Despite his actions, he never espoused Protestant beliefs. But the true Catholic Church was in hiding for centuries. Your idea of there being a "papal Roman Catholic Church" apart from the Catholic churches of Antioch, Alexandria, Jerusalem, and former Constantinople (sorry, no London) is a piece of revisionist historical fiction.