The WMS composite method can be summarised as (1) the achievement of CCSD(T)/CBS valence correlation energy but via the CCSD(T)-F12b method with only double-ζ and tripleζ basis sets, (2) parametrisation to extrapolate the higher-order valence correlation energy from MP2/CBS, CCSD/CBS and CCSD(T)/CBS components and (3) low-cost procedures for inner-shell contributions and scalar relativistic corrections. Ionisation energies were calculated from G4 computations of the neutral molecule and the associated cation; in addition formation enthalpies derived from G4 atomisation values were obtained. The applications Gaussian and ChemCraft were variously employed to carry out the calculations and to manipulate the results.