Pulp also has Different Class under their belt, which is, in my opinion, a bit more consistent than This Is Hardcore. I'd also probably rank Parklife as Blur's essential Britpop album; at the very least, it made the bigger impact on the genre.
Depending on what you classify as Britpop, I could also see throwing in the Arctic Monkeys debut, though most people would throw that into a different genre altogether.
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