"The requirements are set out in CAP168 chapter 8, not 9, chapt 9 is emergency planning."
Agree, the UK interpreted requirements of Annex 14 Chap 9 are in CAP168 Chap 8.
But the whole point is the high level of fire cover required for the type of aircraft operating through LHR in general today.
If they empty one of those big tenders on a small fire that puts the level of fire cover down until it's replenished.
We might all say why haven't they got more tenders, there lies a cost benefit v frequency of incidents arguement.