2009 Vauxhall Corsa draught coming from underneath passenger seat

With a car as new as this , got to go back to dealers for them to examine for cause .

I was going to but I would like some sort of idea of what could be causing this so that I can sound a little more knowledgeable when I do go back. Thanks for your prompt reply as well :-)

Normally any draughts are caused by grommets / rubber plugs not fitted correctly on bodywork or bulkhead where the likes of wiring harness passes through. I've also had heater / air hoses which were detached from the actual vent causing this .Dont know if it could be coming from door seal or where h/brake mounts to floor .I was waiting for my daughter to come home as she has the same car , to see why it would happen under the passenger seat , but she wont be home till late to -night .I can't remember the set up on the Corsa if it has any vents low down on gear stick console.Unusual place for draught , but let dealer worry about it , should be easy to find.Best I can do to help you .