Sorry guys, thought I'd better double check, you were right, it was the break the bank one!! Humble apologies!!!!! The do look a bit similar and I'd had a few pints!!
So it looks like this answer is what I was looking for:
...when you get the feature DOND is automatically open, plus all features/cash are red.
This was the machine that I was playing. All the reels went red but I wasn't on the feature. I had the opportunity to hold but it didn't automatically "come in" if there wasn't anything decent on the reels like 2 similar.