Oh, dear: “while it was otherwise empty”?
Well, it wasn’t empty when you parked in it – meaning it wasn’t available for bona fide visitors.
But can you be evicted for this?
You can be evicted for breaching by-laws – because that’s a breach of your tenancy agreement.
But there’s a process. You have to have received warnings and you must be given notice so you get the chance to appeal to Fair Trading.
So challenge it and, in the meantime, put up a notice asking to rent a spare space from anothe resident.