Employer Duty of Care for cyclist The company I work for provides cycle racks for cyclists in a semi underground carpark that is open at one side. Several cycles have been stolen from this area and one colleage was attacked by a bike thief who he surprised. Another was threatened on another occasion.
The company refuses to install a gated caged area or secure entrance to the car park, does the company have a duty to provide a safe parking area?
Where I live the employer would have an obligation under law to "Take all practical steps", however, one practical step for the employer is to remove the bike racks, as these are attracting the thieves, thus, the employer has addressed the issue. 

I do not think you want to go quoting various legislation at them. The better way is to sell the benefits of people biking (reduce number of car, healthier people- less time off work (careful here -  accidents can count against you, happier more lively people - more productive when at work.). Sell the benefits of not have low life-cruising company car parks (it's not only cyclists who will get attacked) - they might take a liking to the bosses car.... 

When you say they refused - how and what did you ask for? Did you leave room to negotiate, to did you demand a they provide a solution to your problem? Was the refusal from one person (say a low level facilities manager), or from the Executive/Senior management team? 
A flat refusal with no good reason would seem unlikely to me.