You have to look at the returns and not the payout. The payout is correct. A 30p stake on a Lucky 15 totals a £4.50 total stake. If just one leg won at 25/1 then that would return £15.30 total, and £10.80 of that would be profit.
Look at it like this:
A 30p single at a price of 25/1 would earn you £7.80 in returns, and £7.50 of that would be profit.
Let’s not count the double odds consolation bonus. Your one winning leg of the Lucky 15 earned that exact same amount of £7.80 return. But because you staked £4.50 obviously your profit is only going to £3.30 from the Lucky 14.
Because Ladbrokes do double up single leg winner odds on a Lucky 15, your total return would have been £15.30 which essentially is the £7.80 returns doubled, minus one 30p stake which you never paid out.
So essentially your winning bet was £7.80 returns (which includes a 0.30p stake from the actual bet) plus a bonus matching that returned amount of £7.50 (which doesn’t include a 0.30p stake).
Look at it with a stake of £1 on a Lucky 15
A 25/1 single pays out £26 with £25 of it being profit
A 25/1 single leg win in a Lucky 15 pays out that same £26 return with just £11 profit (because your stake would have been £15).
If you earned a double odds consolation, your total would be £51 return (the initial £26 return doubled, minus one unit stake)and therefore £36 of that profit.
Lucky 15 bonuses the bonuses and consolations on this bet are available for Horses, Greyhounds and Correct Score, First Goalscorer and Half-Time/Full-Time Football bets, with the exception of Ante Post selections.
Basically it is double your returns, minus one unit stake.