Removing van from storage

Hi,

I’ve got some work to do on my van but although I understand the storage facility is open during the day I’m told I can not to bring my van back to my home address to work on it. 
After seeing articles on how people are using their van I must admit it would make a good office for some piece!  I anticipate social distancing would be more difficult at the storage facility if we’re (all) there working on vans.

I can understand reasons for and against, but I’ve been told the reason I can’t move it is ‘it’s the law’.  Whilst I’ll abide by the rules I’m just wondering what the ‘law’ is around this subject as I’ve not seen anything apart from the static/residential holiday sites.