Meikleour, try CAP 168 airdrome licensing. This is an excerpt.
Rescue and Fire Fighting Service (RFFS) vehicles are essential to airfield operations at all times and response and deployment times are of vital concern to aerodrome licence holders. Although it is unlikely that RFFS response time will be significantly affected in visibilities down to 200 m, temporary relocation of vehicles to strategic points may be necessary for a very large or complicated aerodrome. In visibilities below 200 m there is greater probability that response times will be affected. Operational Instructions and training should be developed in accordance with the guidance at Chapter 8, paragraph 25.5.
