Played a few of these £70 jp machines yesterday.
Seemed a bit pointless playing the £1/spin on some of the machines - £10 gone in no time with the best offer on a board being £2.40. May as well have stuck with 50p play.
Other machines slightly better. Red gaming machine (can't remember the name) gave JP from safe (double/nothing all the way to £70). Cops 'n' Robbers was the best. 50p play, £70 jackpot. Got JP after about £20 from Cops 'n' Robbers feature then next board got £40 from Cash or Bust.
Came out of service station with probably about £30 profit, similar to £35JP/50p play. Just easier now to throw so much more money in than before. I'd rather stick with the £500 machines if it's £1 a play though...