Upper-class motors? Ah, those'll be the ones nicked by the local scroats. The 'J' reg. Carltons are the cars owned by genuine Lidlites.
LIDL's good if you need to buy in bulk, are throwing a kids' party, or have a humungous family to feed, so the deals on the cheap fruit, veg, rice, etc. make sense. The Brighton LIDL stocks a very nice German potato salad and a fairly decent line in salamis. What put me off it was the rather nasty niff around the raw meats section, though: I suspect some packages were rotting quietly away, and no-one had noticed.