It is an Auto Free Top Bongo - do you still think it would be the sunlight?

When it rains heavily we get two leaks on the material between the front windscreen, roof and front doors - on both driver and passenger side.

Can't work out how to copy photos in here directly, but here's a photo of the driver side: https://www.dropbox.com/s/tjx3igtnsmllm2h/Bongo%201%20edit.jpg?dl ...