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No, no bigwigs. Just people who are never willing to give up their spots when asked claiming that they need them even though they are not using them at that time and facilities people who arent willing to enforce the use until they need to because we are losing access to some. The allocations are controlled by our own facilities people so they are aware when people leave.
I will bring up these points though when I go to raise it. Thanks.
No, there is no legal obligation. You need to find out more--i.e., who are these people who allegedly have spaces allocated to them who don't seem to ride a bike in? Are they bigwigs who think it's OK to occupy a space while only commuting by bike occasionally? Etc. It might be employees who left a long time ago and never bothered to notify the building management.
It's usually a good idea to go through the most senior people first if you can.
Other than that, all the usual applies--people who commute by bike are fitter and work better, the company should actively promote cycling more, they could get a consultant in to advise them about installing better bike parking (shameless plug, a friend of mine does that sort of thing), e.g. more space-efficient, managed better (to avoid the problem of vacant stands) etc.
Importantly, try not to come across as a complainer but be positive in your interactions. Bike parking often appears to people as an annoying chore that they'd rather not have to deal with.