After a five-day trial, they were convicted of conspiracy to steal the animal. Horne, Jim O'Donnell, Mel Broughton, and Jim Buckner were fined £500, and Horne and Broughton were given an additional six-month suspended sentence. Horne and the others continued with their mission to free Rocky, and in 1989 launched the Morecambe Dolphinarium Campaign, picketing the dolphinarium, handing out leaflets to tourists, organising rallies, and lobbying the local council. Losing ticket sales, the management of Marineland eventually agreed to sell the dolphin for £120,000, money that was raised with the help of a number of animal charities, including the Born Free Foundation, and supported by the "Mail on Sunday", which launched the "Into the Blue" campaign to free Britain's captive dolphins. In 1991, Rocky was transferred to an lagoon reserve in the Turks and Caicos Islands, then released, and within days was seen swimming with a pod of wild dolphins. Peter Hughes of the University of Sunderland cites Horne's campaign as an example of how promoting an animal rights perspective created a paradigm shift in the UK toward seeing dolphins as "individual actors" who should be viewed in the wild if tourists want to interact with them. As a result, Hughes writes, there are now no captive dolphins in the UK. Together with Keith Mann and Danny Attwood, Horne was part of a small Animal Liberation Front cell that raided Harlan Interfauna, a British company in Cambridge that supplies laboratory animals and organs, on 17 March 1990, Horne's 38th birthday. The activists entered Interfauna's animal units through holes they punched in the roof, removing 82 beagle puppies and 26 rabbits. They also removed documents listing Interfauna's customers, which included Boots, Glaxo, Beechams, and Huntingdon Research Centre, as well as a number of universities. A vet who was an ALF supporter removed the tattoos from the dogs' ears, and they were dispersed to new homes across the UK. As a result of evidence found at the scene and in one of the activists' homes, Mann and Attwood were convicted of conspiracy to burgle and were sentenced to nine months and 18 months respectively. Horne was one of a number of protesters who attacked an animal research conference at Exeter College, Oxford. They overturned tables and smashed 50 bottles of vintage claret, after fighting with police to enter the conference hall. Horne and five others were charged with violent disorder.