Single win part of the bet refunded.
you have a double and 2 singles running for you.
If both win, you in effect have the 7 bets up
if 1 wins, you have a single win, your refunded single and a double;
ie; £10 win patent with 1 winner @5/1, 1 loser and 1 non runner
£10 x 5/1 returns £60
£10 x 5/1 x 0 ( non runner) returns £60
£10 x non runner returns £10....... making a grand return of £130