Unless you need a car to do your job then it would be interesting to hear the reasoning behind this , if you arrive at work and do not need use of a vehicle during your work hours i cant see how they can tell you that you need to?
I often need to be at bus depots or metrolink stations at silly times of the day e.g 04.30 of the a.m variety or finish at silly times - e.g 02.00 & this might be up to 35 miles away from home (I also cover cross boundary journeys) so I could be in Manchester one day then Oldham or Warrington or Halifax or Huddersfield etc etc.
To get there/back from some places I would have to set out at 1.30 - 2.00 a.m by public transport (which doesn't exist where I live at these times) or earlier by bike.
I could have a 3 hour cycle in each direction *if I were allowed to*.
To top all this off - if there were an unforseen issue regarding a service or route - my management would re-issue me an alternative duty & I would then have to re-locate using my car.
Cycling for three hours in a shirt trousers & tie uniform not my idea of fun either (I could do this on shorter commutes in guaranteed dry weather).
My rucksack for work weighs approx 20k too - so the public might not appreciate a sweaty guy on their journey (no shower facilities either except for those top nobs at HQ).
It is by no means a 'standard' or desirable job with very unsociable hours/facilities etc but it pays o.k for the area I live in so I just crack on.
It does however significantly impact on family & social life & leaves a lot less time for cycling.