Saturday hours by appointment! As a plumber, your duties may include. Set up an appointment with one of our technicians! call today! We cover oxfordshire, wiltshire, gloucestershire, northamptonshire, warwickshire, berkshire, hampshire, surrey, london, hertfordshire, west midlands and bedfordshire. And find out why we are considered the “plumber referred by your friends”. Dyno-rod have been unblocking drains nationwide for nearly years dyno-rod.