Midwifery became legally recognised in Britain in 1902 with the first Midwives Act. Despite this, there continued to be a large proportion of women who were supported by midwives who had not been formally trained. Before the First World War and, in some areas, until the mid-1930s, the majority of working-class women in Britain were attended in childbirth by a local woman. By 1905 all midwives had to register as bona fide or they could not call themselves midwives. After 1910, bona fide midwives could no longer legally attend births without being under the supervision of a certified midwife or physician. The Central Midwives Board (CMB) was established as part of the Midwives Act. It also set up Local Supervising Authorities that provided routine supervision of midwives. There was a series of additional Midwives Acts- in 1918, 1926 and 1936- which provided stricter guidance in assuring that only qualified midwives were able to attend births. The National Health Service (NHS) Act in 1946 provided free access for all women to doctors as well as midwives.