Being on the outskirts at this time, many expensive and large houses were built to house London's expanding population of "nouveau riche" whose journey to the commercial heart of the capital was made possible by the birth of the railways and the first omnibuses. The latter were first introduced into central London in the 1820s by George Shillibeer, following his successful trial of the world's first school bus for William Allen and Susanna Corder's novel Quaker school, Newington Academy for Girls. By the mid-19th century, Stoke Newington had "the largest concentration of Quakers in London", including many who had moved up the A10 from Gracechurch Street meeting house in the city. A meeting house was built in Park Street (now Yoakley Road) by the architect William Alderson, who later designed Hanwell Pauper and Lunatic Asylum. The Anglican St Mary's Church, designed by Sir George Gilbert Scott in 1854–58, replaced the older parish church (also St. Mary's), which survives on the opposite side of Church Street.