The guitarist, who quit the Wonderwall hitmakers in 1999, joined singer Gallagher to perform two tracks from the band's heyday at the special concert in London earlier this month (Oct13).
Following their live renditions of Live Forever and Columbia, Arthurs told NME magazine, "Once I plugged my amp in it was as if we'd never been apart. We've both matured. Liam's off home to bed now, so maybe he's more professional these days."
The gig was held as a tribute to Charlatans drummer Brookes, who died of brain cancer in August (13), aged 44.