When you back at 5.0 for £10, you win £40 if the horse wins and lose your £10 if it doesn't. On an exchange you take a price someone else has offered to lay, shown in blue on the ladder.
Back: what it means in exchange trading
Betting that a selection will win.
18+. Trading on exchanges carries real risk and many people lose money. Set limits before you start. Support: BeGambleAware, GAMSTOP.