Sir David Nicholson has signed a wall at an NHS conference to "pledge to become a dementia friend," someone who is trained to help spot the early signs of the disease.
More top news
'Flushable' wet wipes are blighting beaches and blocking sewers, costing water companies and tax payers more than £80 million a year.
The Late Late Show host also allowed the singer to take the wheel in a Carpool Karaoke first.
The lender, which is the worst affected by the PPI mis-selling scandal, said it has also set aside £150m for other conduct issues.