A UK Court of Appeals has found an 8 month sentence for convicted blackmailer Deborah Morrison to be too lenient. She has had her sentence extended to a period of 2 years.
The judges said the original sentence had been "unduly lenient".
Over five years Morrison sent dozens of emails and letters - some containing white powder - to individuals and companies which had, or used to have, connections with animal research organisations.
One firm she targeted had links with Darley Oaks Farm in Newchurch, Staffordshire, which bred guinea pigs for research until January 2006.
In total Morrison pleaded guilty to one charge of attempted blackmail, three charges of interference with a contractual relationship so as to harm an animal research organisation, and two charges of attempting to interfere with contractual links to animal research organisations.