  This note intends to give an estimate on the sensitivity of the channel ee to
ee at the future ILC250. At variance with other two fermion processes, the
so-called Bhabha process is influenced by t-channel Z/photon exchange. In spite
of the complexity of the resulting angular distribution of this process, one
observes a good sensitivity to Zprime exchange, similar to those observed in
annihilation channels. This feature is illustrated within the gauge-Higgs
unification model, GHU, which shows an impressive indirect sensitivity to the
mass of Zprime particles, up to about 20 TeV for the leptonic channels. Beam
longitudinal polarisation and high luminosity are the key ingredients for this
result. Measuring the Zprime ee coupling with the Bhabha process allows to
measure separately Zprimemumu and Zprimetautau coupling, which serves for a
precise test of lepton universality. Zprimebb and Zprimett couplings show good
sensitivities to GHU. LHC and HE-LHC sensitivities are also discussed.
