Things may have changed but in the mid 1990's whilst the Sultan was in London at Christmas taking his children to the pantomimes the religious police were driving around in Brunei insisting people remove any Christmas decorations, lights etc that could be seen from the road.
The same religious police had the right to knock on your door at any time during the night and ask to see a marriage certificate if you were there in the house with a woman. Expulsion from the country within 24 hours if you were unable to produce one.