The game is similar to razz poker with minor exceptions...
The London lowball game is played very much like the Seven-card Stud Poker game and Razz poker(Razz is a form of stud poker that is usually played for ace-to-five low )using a total of seven cards, of which the first two cards and the last card are dealt face-down and the four in between them is dealt face-up.
How to play London lowball poker
In London Lowball Poker the lowest five-card hand wins the pot and the lowest possible hand is a Royal Six, A-2-3-4-6, since both Straights and Flushes count.
Since the Ace is used as a low card in this game, a Pair of Aces is lower, and therefore much better, than a Pair of Deuces.