There is so little Bruckner played in Cardiff and Swansea that one is grateful for anything but having said that I've heard two fine B7s in 2011 played by Welsh orchestras - the Orchestra of WNO under Lothar Koenigs (they do play Wagner fairly regularly) and BBC NOW under Kazushi Ono - new to me but an impressive CV, and he's the first I've seen since a younger Haitink to conduct it without a score. It was a magnificent performance (I've heard many B7s since my first 40 years ago).
I cut my Bruckner teeth with Haitink and the LPO in the 1970s - they were a fine Bruckner orchestra then. My greatest live Bruckner experiences in recent years have been with Haitink and the LSO, Concertegebouw and CSO....I was a little underwhelmed by an LSO B6 in the Barbican with Davis a few years back........
I was introduced to Bruckner by someone who'd heard Furtwangler conduct 7 in Vienna around 1951, so perhaps everything's relative.