To me Blur always had the label "Brit Pop" attached to it.

This was pre-Britpop when they were doing their whole shoegazer thing.

I may be mistaken but I believe they did at least begin as a band on the indie circuit and didn't go major until after Parklife.

Nope

First album came out on Food Records , an EMI subsidiary.

Eh, my mistake. So yeah, seems this little marketing technique's been in place for quite a while. BTW Urban do you know if Oasis were ever really indie?

go to the last page of the krautrock thread in avant garde/experimental, immediately.

Oasis were signed to Creation Records just before Sony bought out half of the company. But without Sony's money the label would have gone under and Oasis would never have been able to make a record.

So they signed to an indie label but released records on a label that Sony owned 49% of.

Are they indie?

I don't have a clue , i'll let everybody else argue that one :D