Simply organising and equipping the Territorial Army along the lines of the Regular Army would treble the size of the British military arms industry because there were 6 Regular Army infantry divisions and 14 Territorial Army infantry divisions.
Haldane wanted a Territorial Army of 28 divisions, but the Cabinet would only let him have 14. That's probably only what peacetime voluntary recruiting would produce anyway. But if Lloyd George can be persuaded to provide the money for 14 divisions worth of modern equipment for the TA plus a 100% reserve that would have helped mobilisation a lot. However, somewhere in the History of the Royal Engineers there is a statement that Haldane made to the Army Council which was along the lines of..
Don't ask for everything you need! If you do I won't be able to obtain everything I can get.
The Liberal Government wanted to spend more on its proto-welfare state not a better equipped army.
Also if you could find more money accelerate the development and production of the new medium and heavy artillery pieces. Double the scales from 8 per infantry division to 16 so that there is an establishment of 320 guns (108 Regular and 212 Territorial) plus a 100% reserve. While we are at it buy enough Holt or Hornsby Tractors before August 1914 to tow the medium and heavy artillery. Both measures will help expansion of this artillery branch and help with the development and production of tanks later on.