An act passed by Edward VI to safeguard his subject's herds and money required drovers, from the mid-sixteenth century, to be approved and licensed by the district court or Quarter Sessions there proving they were of good character, married, householders and over 30 years of age. Considerable expertise meant that flocks averaging 1,500 to 2,000 head of sheep travelled 20 to 25 days from Wales to London yet lost less than four per cent of their body weight. Obliged to trek much further than from Wales, Scottish drovers would buy the cattle outright and drive them to London.