All due respect westham, I'm not. I have no knowledgde of such areas outside of Heathrow, but we use the Code E LLZ critical area of 660m in length, and 60m from the runway centreline for all a/c, apart from A380 which is 1000m long, the additional length of 340m being extended to 90m from the runway centreline. The GP critical area for 27L extends across the taxiway leading on to the runway from holding point SB1.
In CAT II/III ops the Localiser Sensitive Area we use for all aircraft is 137m from the runway centreline, apart from when an A380 is on the ground and moving when we use the Code F dynamic LSA which varies from 160m (second half of runway) half of runway to 192m (first half) from the runway centreline, apart from the first and last 200m of the runway when it's 137m.
The GP sensitive area is far larger than the GP critical area, and this affects both 27L and 09R line-ups from the south. 27L has CAT II/III holds on the south at the full length, but 09R does not.
All those figures are from memory, so they might not be completely accurate!