A group of well-to-do pensioners who lost their savings in the credit crunch staged an arthritic revenge attack and held their terrified financial adviser to ransom, prosecutors said yesterday.

The alleged kidnapping is the latest example of what is being dubbed “silver crime” — the violent backlash of pensioners who feel cheated by the world.

“As I was letting myself into my front door I was assaulted from behind and hit hard,” the financial adviser James Amburn, a 56-year-old German-American, said. “Then they bound me with masking tape until I looked like a mummy. I thought I was a dead man.”

He was freed by 40 heavily armed policemen from the counter-terrorist unit last Saturday. The frightened consultant was in his underwear, his body lacerated by wounds allegedly inflicted by angry pensioners.