Apparently a Lufthansa A343 on the way into LHR at the moment.
Not only did Lufthansa send an A340 yesterday, but KLM had an A330 operating between LHR & AMS on both the mid-day service and the early evening flight.
In addition to the ER reg 747-4F, there was a later 747-4F arrival from Nairobi, by Astral Aviation, plus 2 Egyptair A330F. American Airlines operated only 1 Passenger flight and 4 Cargo flights (using their regular aircraft but minus the Human Freight).