Ok I am gonna have to hang around and wait for a response as I can go no further!

I need to remove the windscreen cowl panel off of my 1990 Saff. All that appears to be holding it on now are what look like three plastic screws, one each end and one in middle, along edge near winscreen. However they are clearly not screws but some strange mechanism and I don't know how to remove/undo them! Anyone know?

Incidently I am removing it to further my investigation into where water is getting in and soaking the passenger footwell. Has anyone else had this or is it a known fault that occurs after time? Any ideas?

Oh and also some electrics have stopped, i.e. clock, wipers, rear windscreen heater, fuses are not blown though.