Try cyclescheme site had some carbon and health stuff on there (seems down at the minute)
They have done the homework really.
Also look at Number of allocated parking spaces vs employee numbers, car share etc to bundle measures together.
If your pushing for cycle to work make sure it’s he one that includes LBS’s as that is a great benefit for local economy/pr
For the other side….
Perceived greater risk to employees (real or not), how bike friendly is the surrounding area.
How many employees live within 2,5,10 miles of work. How many currently cycle/would cycle. Suggest organising a company survey to gauge interest/define the size/scope of any work. PITA if you double the cyclists but only have facilities for a 25% increase.
Finally – Don’t let them near this place!