It was probably a slow day by 70 year old Paul McCartney's standards. First he went to Paris to be decorated by the president.
He then hopped on a train to London's King's Cross. He met up with other train passengers. Members of the cross-UK-musical-train ride "Africa Express" were performing, and Paul showed up for the rehearsals. He posted a few photos to his twitter account.
On stage he teamed up with, among others Damon Albarn from Blur, drummer Tony Allen, Gruff Rhys of the Super Furry Animals, ngoni player Bassekou Kouyate, former Led Zeppelin bassist John Paul Jones, the singers Rokia Traore, Terri Walker, Fatoumata Diawara, Martina Topley-Bird, Shinghai Shoniwa and several more. They played two Wings songs from 1979, Coming Up and Goodnight Tonight.