Ok, so I had another look under the bonnet, but it was quite dark so couldn't really see anything, will try again in the morning. There did look to be quite a few pipes all over the place, am anxious that I'll squeeze the wrong thing.
hi again,
I've tried to take pics tonight ( in dark - not good) so here is a cropped close-up of my earlier pic,

at the upper RHS of pic , you'll see a brown plastic bracket( not fitted to your panda) just to the left of the BLUE fuel hose we keep mentioning
behind the Brown bracket you'll spot a Black shiny semi-circle..THIS is the bottom of the drain tube / AKA Duck Bill,
squeeze it's longer edges together,
mission accomplished
once you've got over the elation ..

you MAY want to do the other one..!!
upper LHS of pic..splashed with mud on my car
You'll notice they are BOTH directly under a shiny Aluminium Rivet on my car,
looks as if your car doesn't have these , or the Sound deadening material ...
naff picture taken in dark
you CAN see the curved lower part of the Duck-bill behind "MY brown bracket" though

,
over view,
follow the BLUE fuel hose towards the REAR of the car,
trace down the rear of engine-bay ( under a Shelf -type feature),
move slightly LEFT( towards centre of car) ,
that's the duck-bill..!!,
have fun,
Charlie