  We present preliminary results for the spectrum and decay matrix elements for
heavy-light and heavy-heavy mesons, obtained on the 64-node Meiko Computing
Surface at the University of Edinburgh. Quark propagators are computed with an
O(a)-improved fermion action on 24^3x48 lattices at beta = 6.2, using three
values of the quark mass up to around the strange quark mass, and four values
of the quark mass in the region of the charm quark mass. We compare results for
the hyperfine splitting in charmonium with those obtained using the
conventional Wilson fermion action and find that the splitting is 1.83(15)
times larger with the improved action. Our measurements of f_B indicate
non-scaling corrections of the order of 20% to the Heavy Quark Effective Theory
expectation. A comparison is made with results obtained on 16^3x48 lattices at
beta = 6.0.
