Funny you should mention holey moley, played it last night.
I'm signed up to this whole 50p play +6% thing.
I was playing it on 30p play mega spin, not realising it had a 50p mode. And way, it was playing like shit and i had put about £20 through. Still had time and money to burn, so I stuck another £5 note in and then saw the 50p play button.
First spin on 50p play, (not sure how many actual credits before the first spin mind) it rolled in two 1's and therefore gave me 12 nudges for £25 on a 10, i drunkenly decided to go low and it gave it to me, for a £70 win of the top feature. Totally out of no where, hadn't offered above £5 when I was playing on 30p play.