Crash was with summer, tash, ed, Sophie, andrew and Chris. Andrew now has epilepsy but hiding it. Tash is dating Ed. Kyle and jade together but Jade about to go to LA for 6 months to set up her bootcamp business.
Basically the crash happened because of Andrew. Previously he, tash and Ed had invented a gambling/anti-gambling app (still don't really understand what it did) and Andrew sold it to a chain of casinos, after Tash specifically said not to. This came to light in the car - and that Andrew had forged Tash's signature to sell it. Tash and Andrew were screeching at each other. I THINK Andrew bumped Chris's arm which caused Chris to lose control of the car.