This is the story of Humbert a working horse Mister Firkin his master & the Lord Mayor of London. Mister Firkin was a scrap-iron dealer & he would travel the streets of London with Humbert shouting ' Any scrap any old iron for sale?' The Brewery horses are terrible snobs & show off about how important they are because they are used in the Lord Mayor's Show. But when disaster strikes it's Humbert who rushes to rescue & escorts the Mayor to Mansion House.