To my knowledge as a past resident of Staines, there is no memorial or plaque of any description at or near the site, alongside the A30, (Crooked Billet).
Personally I think there should be. Many other disasters, ( and albeit lesser in scale), in the UK and elsewhere have had memorials established.
I actually saw that aircraft depart, and shortly after leaving LHR, unaware of the accident drove close by. Thereafter, I was a resident on the estate close by.
I do hope that this topic can start the momentum for a memorial.
May all those souls that perished, rest in peace.