Billy Hill and Jack'Position' Comer were among the most notorious criminals in London up until the 1950s. Dramatising the violent reign of 2 of London's most notorious gangsters, Billy Hill (Leo Gregory) and Jack'Position' Comer (Terry Stone), ONCE UPON A TIME IN LONDON graphs the legendary rise and fall of a nationwide criminal empire which lasted until the mid-fifties and then paved the way in the notorious Kray Twins and The Richardsons. This could be the story of the rise and fall.