I've seen cheese puffs most everywhere, and Tesco has cheese balls, which are the same as those Planters ones in the states, I think, and there's always Wotsits, if that would help your craving. I've never seen proper Cheetos, but Nik Naks have the same texture as the regular Cheetos(though sadly, they don't make a cheese flavoured one) so I sometimes munch on those.