Originally Posted by
jackieofalltrades
Is that the old runway that now is Taxiway W south of 09R, part of R north of 09R and used to extend to what is now the A10W exit of 09L?
Yes.
Not to be confused with Heathrow's original 34L, a small part of which is still discernable as A9W.
And do you know when that runway was decommissioned?
It was closed to allow the construction of Terminal 3's Pier 7 for the 747, which opened in 1970, so probably in the mid/late 60s.