One shouldn't confuse an inability to play ones instrument with being Working class. The Jam weren't posh, but proficient. Pink Floyd were borderline posh, but by his own admission, Nick Mason is a very average drummer.
Whilst Noel has progressed, Liam can't sing, although shouts pretty well, and the original band line up were woeful. We gigged fairly regularly with a band called heavy stereo in 95, Gem Archer was their stand out member, he joined Oasis soon after that, then Steve Whites drummer joined to play drums.
My mate’s wife is quite possibly the only person to have bought a Heavy Stereo album.