Hi there,
I am in Stockholm.
I use Selfsat H50 D4 ( gives equivalent performance to 60-80 cm conventional dish) for Intelsat 901 (27.5°W) and reception of BBC-SATBACK works ok (S/N between 7,1 -7,6 db on 11495 V 44100 9/10 without pixelation or sound break up).
I know i dont have extra fade margin to mitigate rain outage but you are closer to central beam so 90-120cm (bigger is often better!) should work for you..