My adam Jam has LED and mine do it so not only on the more up market ones, the LED's are available on Jam's also its a feature all Adam's can have not just the Slam and Glam,
anyway mine does this but i ain't bothered, it clears in like 3 seconds and if you look they have a small hole in the outer lens cover so Vauxhall clearly know this is an issue and the hole is in to have the condensation clear quicker,