What causes leak in passenger footwell of my Vauxhall 2007 Tigra?

My passenger footwell is full of water. I do not believe this has come from the roof as can see no evidence of leaking there. I located the drain below the windscreen for the drivers side and cleaned the debris from here but could not find the passenger side drain, as battery in the way. I have seen some water seeming to come in from the the bottom of the passenger door. I took my car to the Vauxhall garage today and was told I have 2 leaks and I need the scuttle box resealed and resealing behind the pedals costing £640. This doesn't seen right to me as if there was a problem with the peddles surely water would be in the drivers footwell too, also 2 leaks what are the chances of that? As for the scuttle box does anyone know if that sounds like the cause??