Radio Seagull can be heard on 747 kHz AM in the Netherlands. But in Woerden this frequency is dominated by nearby MCB Radio from Alphen aan de Rijn. A good alternative is to listen after 8 pm UK local time to the relay via Carillon Wellbeing Radio from Leicestershire on 1476. This is also a low power AM broadcaster, but despite their 250 Watts “only” this station is received very well here in Woerden.
I received a nice email as QSL Radio Seagull 1476 kHz via

QSL Radio Seagull via CWR UK
QSL Radio Seagull via CWR 1476 kHz UK