Glueballs and topology with O(a)-improved lattice QCD

We present evidence for unquenching effects in Nf = 2, 16332 ensembles by comparing with 'equivalent' quenched data at r-circumflex0 ≅ 5.0. A (small) VEV for torelons signals (weak) string breaking. A 15 - 20% reduction in the scalar glueball mass relative to quenched is argued to be (in part at least) a discretisation effect. We find a chiral suppression of the topological susceptibility consistent with expectations, and agreement between fermionic and gluonic methods for measuring the topological charge