I still don't understand how I could have made more than £18 from a £10 free betI have one more left and very keen to know!
Loads are like that though. The point is to deliberately try and lose the bet so that the cash ends up in your exchange.
Losing is ideal, but you can't consistently pick bets which will lose. If you could then you'd be better off just becoming a bookie
The real point is to extract as much cash from each free bet as you can!
Such as you have wager x10 to unlock a £30 bonus.