Enfield-born Charlotte Dujardin received an OBE for services to equestrianism, following her two gold medals at London 2012.
More top news
Photos show the extraordinary surgical procedures to remove the growth.
The Met Police says 143 firearms have been handed in at stations across the capital in just seven days, including two antique machine guns.
The pair filmed themselves clinging on as the train travelled from Essex to London at high speed.