Thanks for the explanation of the LHR time based separation. That said, having operated a heavy across many parts of the world this is the first time in my long career I have seen this, due to winds, one lives and learns.
That said too, looking at the TAF with strong x winds forecast at prob. 40 % tempo, I would have expected to be able to land but would be carrying extra fuel to keep ALL options open.
...and yes, HARRIS, I WAS paying very close attention.