After the establishment of Protestantism in Britain, Catholicism was for a time an illegal religion and then a barely tolerated religion. Not until 1850 was a British Catholic hierarchy reestablished. Only in this century has it been as open about its activities as any other religion. Although Catholics can now be found in all ranks of society and in all occupations, the comparatively recent integration of Catholicism means that they are still under-represented at the top levels. For example, although Catholics comprise more than 10% of the population, they comprise only around 5$ of MPs.
A large proportion of Catholics in modern Britain are those whose family roots are in Italy, Ireland or elsewhere in Europe. The Irish connection is evident in the large proportion of priests in England who come from Ireland (they are sometimes said to be Ireland's biggest export!).
Partly because of its comparatively marginal status, the Catholic Church, in the interests of self-preservation, has maintained a greater cohesiveness and uniformity than the Anglican Church. In modern times it is possible to detect opposing beliefs within it (there are conservative and radical/liberal wings), but there is, for example, more centralized control over practices of worship. Not having had a recognized, official role to play in society, the Catholic Church in Britain takes doctrine and practice (for example, weekly attendance at mass) a bit more seriously than it is taken in countries where Catholicism is the majority religion - and a lot more seriously than the Anglican Church in general does.
This comparative dedication can be seen in two aspects of Catholic life. First, religious instruction is taken more seriously in Catholic schools than it is in Anglican ones, and Catholic schools in Britain usually have a head who is either a monk, a friar or a nun. Second, there is the matter of a attendance at church. Many people who hardly even step inside a church still feel entitled to describe themselves as 'Anglican'. In contrast, British people who were brought up as Catholics but who no longer attend mass regularly or receive the sacraments do not normally describe themselves as 'Catholic'. They qualify this label with 'brought up as' or 'lapsed'. Despite being very much a minority religion in most places in the country, as many British Catholics regularly go to church as do Anglicans.