Re:
Yes, decent components and the forged rear dropouts are definitely a step up from your average cheap supermarket bicycle. I think that chainguard was throwing me off a bit, made the chainset look like one of those cheap ones with an integral chainguard and an all-in-one steel spider with the extra rings spot welded on.
Can't help you with the brand though. Not sure how much the weight of the whole bike will tell you about the frame either, the difference between the lightest steel frame and an entry level plain guage cro-mo frame might only be a pound or so, no more difference than you might get between a lightweight pair of tyres and a heavy pair. :?