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Probably. I just had to do mine a couple of weeks ago and there was a sideways and up down buckle (probably about 5-10mm) in the rim, but you could only see it once it was on a wheel balancing spinning thing.
Might be worth a look - you'd be able to see it when they change your winter tyre out I imagine. -
Get the geometry looked at. A lot of Kwik Fits now have a Hunter machine, which are awesome. My local place doesn't charge to check it and if after that something is miles out it's £20 per adjustment, so worst case £160, but on the Merc you may well get away with just adjusting one side or end. If the geo is off it'll also make the car drive much better.
Buckled wheel rim for weird tyre wear?