Skinsfan

One of the ep 4 synopsis said something about a revelation or similar to that.

Katie finds herself increasingly tested as she juggles relationship problems with helping at her mother's wedding-planning business. A disaster ensues at an over-the-top Wag ceremony - but when she turns to Emily for help, even more problems are unearthed

And as I doubt Naomi cheating (which I don't think Katie will know) is the big thing, so that's why I reckon Emily in her temper reveals her dad's affair years before. That would make Katie really mad at her and it would explain why Emily deserves the slap.

The Thomas running thing is so lame and just obvious tacked on to give Thomas an ending. But as it is his character ending I reckoned it should be in the list.