Cornelius and his three brothers came over in 1569 two years after the Spanish terror. He stayed in London and the others went to Clanfield and Windrush. There is plenty of stuff written including a history of Clanfield and the Victoria County History. I have traced every generation in my own line back to William of Clanfield.
the reason that I know that 1569 is correct is because I came across something online from 1692 which was a sort of census of 'Strangers' which stated that Cornelius had been resident in London for 23 years.