At a recent meeting (7 Feb.2017) with two of the local councillors, and representatives from Leeds City Council Highways Department, and the Police, it was confirmed that the Council was unable to do anything further in connection with traffic speeds, and that West Yorkshire Casualty Reduction Partnership was responsible for the introduction of cameras, fixed and mobile:
These
 have changed over the years but since April 2009 we have been working 
to the following conditions
 based on the number of accidents where someone is Killed or Seriously 
Injured (KSI) and a points system where each KSI accident scores 5 
points and slight injury accidents score 1. Fixed camera lengths 
automatically qualify for mobile enforcement as well and
 both can be used together.