Could he pop back into his old school and see if his ex-form tutor would sign it? That’s what I suggest to my students who ask me – we’re a sixth form college so I rarely know a student for more than 22 months.
I get out of signing them for friends by having lost my passport, and it expires this year anyway.
They do. Or they did, anyway. When I applied aged 16-or-so they rang up the neighbour who’d signed mine.
I once signed to say I’d known Mark R***** for 8 years. The passport people wrote back to him pointing out that his name is actually Mark D*******, so I signed again to say I’d known Mark D******* for 8 years.
He sent a letter in with that application saying he’d always gone by Mark R*****. They told him he could have a passport in that name if he got sent in a letter from an older relative verifying this, so I signed another photo/form verifying Mark R***** and he sent in a note from his mum.