Looks like im gonna be at LHR Friday too, spotting with mum
If my calculations are right, heres the runway organisation for Friday.
Morning takeoffs before 3pm will be on 27L
Morning landings before 3pm will be on 27R
Afternoon takeoffs after 3pm will be on 27R
Afternoon landings after 3pm will be on 27L.
Now, thats good and bad.
1) Late afternoon (1700) has the sun behind you from the top of T2, so u can shoot the landings on 27L well
2) You'll be taking off from 27R, so cant shoot you
If im wrong, someone please correct me!!