A search for single top quark production via flavour changing neutral
currents (FCNC) was performed with data collected by the OPAL
detector at the ${\rm e^+e^- }$ collider LEP. Approximately 600
pb$^{-1}$ of data collected at $\sqrt{s}$ = 189\,-\,209\,GeV were used
to search for the FCNC process ${\rm e^+ e^- \rightarrow tc(u)
\rightarrow bWc(u)}$. This analysis is sensitive to the leptonic
and the hadronic decay modes of the W boson.  No evidence for a
FCNC process is observed.  Upper limits at the 95\% confidence level on the
single top production cross-section as a function of the
centre-of-mass energy are derived.  Limits on the anomalous coupling
parameters $\kappa_{\gamma}$ and $\kappa_{\rm Z}$ are determined from
these results.