I've visited Singapore and it sounds more like American English to me.
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AnonymousI live in Singapore and we use British English. Should we use 'department store' or 'departmental store'?
Use the word that the department(al) store uses for itself.
If you research stores in Singapore, you'll eventually find the following stores on Google Maps:
Lipo Department Store
Takashimaya Department Store
ABC Department
Anonymous'departmental store'
This is not part of British English.