Just thought I would share with you a comment I have had back from a guest who I recommended should organise their car hire through this site:
'........One thing you can be more than happy promoting is the Car Hire on OV. They sent a voucher in time in spite of the short time left. The price was almost half booking it in UK in January! Great service...........'
So if anyone is booking car hire, it is obviously well worth going to the above link!!