... But unfortunately, I can’t work at ISO 800 in Barcelona...
vizzo,
you can screw a neutral density filter onto the lens, so that you can even shoot at 1600 ISO. This works better with a rangefinder than with an SLR, of course, because you can still see through the viewfinder.
You can also develop the Classicpan 400
@400 at ISO 7.5 for 7.5 minutes in Rodinal 1+25. It’s a lovely film and produces a wonderful grain in this combination!
Regards
Oliver