My intention was not to spoil or give ill advise.Why spoil an excellent post with the poor advice in the last half of the last sentence?
Frequent plugging/unplugging causes wear and tear. Fit two singles.
My reason was, just in case the OP thought it would be sensible to still install a DG socket and then announce that they would only operate one appliance at a time, knowing that it is highly unlikely that anyone would keep strictly to that regime.
Of course the sensible way forward is to install two SG sockets, why do you think I mentioned that in the first place, if I did not believe it to be the correct solution under these circumstances?