The work in the long term car park is located behind one of the Harrods Hangars but hasn't started yet. A sign says don't park here while another one says the work will end at the end of February.
Maybe the airport want to dig various test pits as the car park sits on the former council tip. When the airport carries test drillings on Wigmore Park every dog walker for miles spots what is going on. It was not helped by decontamination showers being installed the last time holes were dug on the park.