Harrison’s family enjoyed considerable local standing in south-east Berkshire. His paternal grandfather, Thomas, had established Court connections as surveyor of the Staple to Queen Elizabeth, and his father, Richard acquired properties in Berkshire and Hampshire via an astute marriage with his stepsister.
In 1609 Carleton told Sir Walter Cope* that he would recommend Harrison should Cope vacate his parliamentary seat at Westminster prematurely; but this did not happen.
Knighted in August 1621, Harrison, in 1623, became involved in a long dispute with a Catholic neighbour over the right of presentation to Finchhamstead church, and was asked by the Privy Council to examine a puritan who had condemned Bishop Laud as a crypto-papist.
Harrison helped to implement the Forced Loan in Berkshire, attending a preliminary meeting held at Reading in December 1626.
Harrison was conscientious in his work as keeper of Battel’s Walk, Windsor, for which he was usually paid in arrears.
