Note from colleague in organisation confirm we now write leading arts complex as SOUTHBANK CENTRE. No definite article. Harasho, guys, spassiba balshoy, we do best we can. Be warned, other halls have try this. Is not so long since Wigmore Hall tell us it never had definite article, though most devoted audience find big surprise. I think perhaps is Russian influence, growing in city of Moscow-on-Thames?
UPDATE, 1 Feb: Colleague in organisation has own blog, having started playing cello from scratch! Ochin priatna, Erin! Welcome to blogroll.