Collective Nouns

[tulipflower]

I have read in the book "Understanding and Using English Grammar' that in British English they use plural verb after collective nouns.
Is it always the case or they may also use singular verb after such nouns?

 

[5jj]

We tend to use plural verb forms, but singular verbs are possible.

 

[teechar]

tulipflower: do you have a particular sentence in mind?