Well no one is replying to my query so I’ll have to do it myself. Just found the following article from the Times, dated Feb 17 2006:
The tip from Christina Beardsley at the end, is:
“Christina Beardsley, from the property consultancy Modus Vivendi, offers a ray of hope to owners of unregistered apartments in Barcelona. “There’s a niche market for one to three-month lets, as many people want to live here for a while but not pay a nightly rate. It means less damage to your apartment and you’re not affected by the licence law,” she says.
“You get less money — about £700 a month compared with £2,100 for nightly lets — but it’s still enough to cover the mortgage,” she adds.”
Suppose that could be a good way of avoiding problems with the new law.