A neo-Nazi whose "dream" was to carry out a terrorist attack has been jailed for possessing bomb-making manuals and instructions on how to make firearms.
Jacek Tchorzewski, 18, of High Wycombe, was sentenced to four years in prison after admitting ten counts of collecting terrorist information.
The Old Bailey heard he was connected to a convicted terrorist who had encouraged an attack on Prince Harry.
The Polish national also had a "keen interest" in weapons, it heard.
Judge Anuja Dhir QC said Tchorzewski held "far right extremist views" and was an "offender of particular concern".
She also said he had a "keen interest in weaponry and explosives websites" and was connected to convicted terrorist Oskar Dunn-Koczorowski, who encouraged an attack on Prince Harry and was jailed in June.
The court was also told he had links to the extreme-right group Sonnenkrieg Division and had posted about it on social media.
Following his arrest at Luton Airport in February, detectives recovered an "enormous amount" of digital documents, including "DIY manuals" showing how to make explosives and weapons, the court heard.
It was also told that whilst he was on remand a notebook was found in his prison cell where he had written: "Let's fill our hearts with terror and London's streets with blood."
In another document, Tchorzewski described himself as being among "the most radical Nazis", who related to "other instances of alienated individuals filled with blessed hatred towards humanity, such as cults, terrorist organizations, or lone instances of serial killers".
In a voice recording he said it was his "dream" to carry out an attack and "plan some terrorism", the court heard.
Prosecutor Naomi Parsons said his mindset was "reflected" by the neo-Nazi and occult books he possessed, including a Satanist text demonstrating a "marked fixation with blood, the sexualisation of violence, a paedophilic projection of adult sexuality onto children, and with achieving National Socialist political goals through political violence and acts of terrorism".