A search for single production of doubly-charged Higgs bosons
   has been performed
   using 600.7~pb$^{-1}$ of $\rm e^+e^-$
   collision data with $\sqrt{s}=$~189--209~GeV
   collected by the OPAL detector at LEP.
   No evidence for the existence of $\rm H^{\pm\pm}$ is observed.
   Upper limits on
   the Yukawa coupling, $\rm h_{ee}$, of the $\rm H^{\pm\pm}$ to
   like-signed electron pairs are derived.
   A 95\% confidence level upper limit of $\rm h_{ee}<$~0.08 is inferred
   for $M({\rm H^{\pm\pm}})<$~160~GeV
   assuming that the sum of the branching fractions of
   the $\rm H^{\pm\pm}$ to all
   lepton flavour combinations is 100\%.
   Additionally, indirect constraints on $\rm h_{ee}$ from Bhabha scattering,
   where the $\rm H^{\pm\pm}$ would contribute via $t$-channel exchange,
   are derived for $M({\rm H^{\pm\pm}})<$~2~TeV.
   These are the first results for both a single production search
   and constraints from Bhabha scattering reported from LEP.