Originally Posted by
WHBM
The big Northside ramp west of the tunnel later became the long term car park, not resurfaced, and certainly until the early 2000s had the original concrete surface, looking a bit careworn, with the ghosts of where various flush lights etc had been patched over.
I don't think there was ever a northside ramp west of the tunnel, just a continuation of the parallel taxiway that eventually rejoined the northern runway at the 09L (10L) threshold, just past the threshold of the relocated 15R (originally 16R), opposite what is now exit A11:
You can indeed still see the neglected concrete taxiway slabs on GE, at least up to the boundary fence, and I remember them in the northside staff car park when I used to work in the CTA, though it looks like the car parks themselves are pretty well all tarmac now.
The stretch of the Northern Perimeter Road past the Renaissance is on the line of the original taxiway, and you can still see part of the Heathrow North apron to the south of the road, opposite the Heathrow Academy.