The London Eye is expecting to welcome it's fifty millionth visitor later today.
The lucky 50 millionth visitor will be treated to a ride in a private capsule, complete with champagne.
More top news
A man who met PC Keith Palmer said his murder "sent a shiver down my spine".
Officers were given the touching letter at Brixton Station while they were on a reassurance patrol after yesterday's attack
The 52-year-old had previous convictions for violence but was not on the anti-terror watchlist.