A freight plane like UPS diverts, if possible, at the nearest open (schedule) accessible (weather, limitations) international UPS base able to handle the freight quickly to destination and resolve the problem and new problems (replacement plane, spare parts, crew). Probably it was LHR.
I.e.Emery freight, T.O. Maastricht, Fog at destination Roissy at 4:00 or 5:00 LT, we tried the approach, and then if impossible we diverted to Brussels or Cologne .