Phil & Ted Sport - leaking rear double seat?

[biba]

Hi, I have a Phil & Teds Sport but the double seat, when used at the rear, seems to let in water somehow as my toddler always ends up with a wet bottom and lower back when we use it in the rain. We have the double storm cover which we use so I can only think the water is coming in from splash=back from the pavement - maybe through the mesh sides in the seat. I have tried to see if this is a commom complaint on review sites but have seen nothing. Has anyone else had this experience? I have seen a lot of other P&T's Sport buggies in ED so was wondering if anyone had any advice from a similar experience?

Thanks