BritinBritain
Per Ardua Ad Astra
The obvious answer is the London Fire brigade, however perhaps you are thinking of the Auxiliary Fire Service (AFS) which was used to supplement them? I don't think it was a London organisation though.
http://www.london-fire.gov.uk/OutbreakOfWorldWarII.asp
It was the London taxi drivers.
As there were not enough fire trucks available to fight fires, small mobile pumps were built on trailers and towed behind London Taxi's. Taxi drivers had an advantage of "doing the knowledge" and knew every short cut and road in the city.
Later on Austin trucks were built to carry the crew and tow the pumps and manned by the AFS.
Taxi's was the answer I was looking for.
http://www.bbc.co.uk/ww2peopleswar/timeline/factfiles/nonflash/a6651344.shtml
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