Mr London appears in Channel 4 documentary
A cat on a hospital ward is not something you would expect to see.
Mr London visits patients on wards at The Royal London Hospital to help ease the stress and anxiety of being in hospital.
His owner, Isabella, is part of Pets As Therapy - a charity providing therapeutic pet visits to care homes, hospitals and schools.
Mr London and Isabella have recently featured on a documentary which aired on Channel 4. Catman, hosted by David Baddiel, explored why the nation loves their feline pets.
Watch the episode here.