You could try Greg at cheapholidaycar. His email address is cheapholidaycar@gmail.com
Contact telephone numbers are: 0034 678924438 or 0044 7733108022. I think these numbers are still current.
Greg is on site and very helpful. I'm not sure if he hires these out separately of if they are only for those who hire their cars through him, but it's worth a try!
He has a new website but I don't have the details to hand.
Lynn