Taxi driver Irfaq Naz, 34, was caught by officers in July driving the wrong way down a north London street having travelled down from his Middlesbrough home.
An unsheathed Samurai sword, a machete, kitchen knives, hammers and masking tape were also found in his Vauxhall Astra, after police resorted to smashing their vehicle into his to prevent him from driving on.
While officers were initially called to reports of a dangerous driver travelling for three-quarters of a mile into oncoming traffic, it was only after theyâd detained him that he admitted he was âon his way to kill the prime ministerâ.
He began his journey in the early hours of July 16 and by 4am had reached Kentish Town in north London.
After driving down Camden High Street the wrong way, police found âa knuckleduster in his shirt pocket and an 18 inch hunting knife in the waistband of his trousers,â prosecutor Nick Dry said at Teeside Crown Court.
He added: âIn the driverâs door panel were three eight-inch kitchen knives.
From the rear seat officers recovered a claw hammer, a lump hammer and an axe which were in a plastic bag that also contained masking tape.
âIn the boot they found a machete and a stun gun, shaped as a knuckleduster. That device, a Blast Knuckles 950,000 volt stun gun, was found to be in working order and a prohibited weapon.â
Naz, who had spent time as a mental health patient at Roseberry Park Hospital, was also found to have Â£1,200 in cash and four mobile phones.
A search of his home unearthed the postcode of Number 10 and the names of prominent political figures, related to his âdelusionsâ of killing a world leader.
Naz has been detained under the Mental Health Act after psychiatrists and prosecutors said he posed a significant risk to the public.
He can only be released with the permission of the Home Secretary.
Peter Wishlade, defending, said: âMr Naz, when he is taking his medication, is perfectly calm, rational, articulate and easy to talk to, but unfortunately when not, he is inclined to delusions and regrettably he has endeavoured to carry them out.