Activist Danny Tommo has admitted criminal damage after slashing a migrant dinghy with a knife in the English Channel.The 37-year-old, whose real name is Daniel Thomas, changed his plea to the single charge when he appeared via video link from prison at Portsmouth Crown Court on Thursday.A court previously heard that he had taken a boat into the English Channel and observed the migrant occupants of a dinghy being assisted by the RNLI, Border Force and the French Coastguard.Thomas, whose address was withheld by the court at a previous hearing, admitted using a knife on the dingy which had French personnel on board.