It only had the mid mounted Coventry climax pump if it was a Mk3 (and I'm pretty sure it wasn't 500gpm) The main pump was a pto driven Thompson at 500gpm, foam pump was a vactrol system, guys could pull up to a stop engage pto, neutral on the transfer, pull in the vactrol and be producing foam in 10 seconds. I never got that good they were withdrawn from service before I got my 'rating'.
Mk1s were a constant mesh box (generally) with 1st gear blanked out. The Mk3s had an alison auto. Both were powered by the Rolls Royce B81 straight 8, when they were really working hard you could read the ID plate on the starter from the red glow off the exhaust manifold. :o
Just a technicallity :D the major were the 'carmichael' ULFV mk2
Numpty got his HR license in the Thorneycroft on a very hot day, as the examiner said if you drive this around you deserve a license.
https://www.aulro.com/afvb/images/im.../2009/08/6.jpg
Our one with 'Numpties MIssus' keeping it company (circa 1981 ?)

