An 888x jackpot can still be hard work. We all know that the Goonies and other similar Blueprint slots with multiple features and multiple side-features can all go on the take. Their jackpots are only a bit higher at 1000x.
I think Reel King with the gamble turned off would be safer. If playing on £1, then the jackpot would be £500 like the arcade version.
Safer still would be Time is Money, where the Bandit recently jackpotted it for 250x. I think he used £3 stake and so he got £750.