These days, it seems that approaching any new Saatchi exhibition, especially one that promises to be even bigger than all the previous ones held at the multi-galleried, three-storey Chelsea venue, makes the heart fairly sink. How much bigger, you want to ask, and why use size as a measure of anything? Surely there isn’t enough headspace to accommodate all those loud, clamorous, “look-at-me” artworks favoured by Saatchi all in one go? And this is just Part One. Part Two will be something to look forward to in late October.