Fracking protests: Anger as drilling begins
3 August 2013 Last updated at 08:13 BST
Campaigners say they will march to the site where energy company Cuadrilla has begun exploratory drilling for oil.
Operations began in Balcombe, West Sussex on Friday, after being held up by more than a week of demonstrations.
Campaigners fear the test drilling could lead to hydraulic fracturing, also known as fracking.
Duncan Kennedy reports