Am I the only one who has never won a jackpot on these? 
Very first week they came out won £89 on a cash or bust and that's my best.
Used to regularly win the £70 jackpots, even put in £2 and got a £70 + repeat once.
These machines in my area are definitely not as popular in pubs as they used to be, a few years back (£25-£35 era) used to always sit near the bandit and watch how much went in and really did do quite well.