  We present a determination of the LEP beam energy using "radiative return"
fermion-pair events recorded at centre-of-mass energies from 183 GeV to 209
GeV. We find no evidence of a disagreement between the OPAL data and the LEP
Energy Workings Group's standard calibration. Including the energy- averaged 11
MeV uncertainty in the standard determination, the beam energy we obtain from
the OPAL data is higher than that obtained from the LEP calibration by
0+-34(stat.)+-27(syst.)MeV
