"Sir Ivor Roberts, senior adviser at the Counter Extremism Project, said it 'beggars belief' they are on YouTube 12 years on.

He added: 'It’s sickening to think such material can be easily accessed by children and vulnerable adults — and essentially act as recruiting videos, glamourising and justifying a violent neo-Nazi cause.

'The laws requiring wealthy social media giants to prevent such harmful material from being broadcast are simply not robust enough.'"