If I hold the top left button down it flashes “set”, then the date goes to Sunday and the hands to 22 to 8, and I can cycle through cities. If I choose a city by pressing top left again it moves the hands to the time (presumably) and resets the date.
I've found that on the Casioak with the 5611 module, if you set your home city to UTC, you can't turn DST on or off, it's fixed to off. You have to set your home city to Lisbon, then you can turn DST on.
If I hold the top left button down it flashes “set”, then the date goes to Sunday and the hands to 22 to 8, and I can cycle through cities. If I choose a city by pressing top left again it moves the hands to the time (presumably) and resets the date.
I can’t find a way to switch to BST.