Apart from collective nouns like police and cattle that always take a plural verb, there are different approaches taken in different countries where English is spoken. In American English, the general tendency is to use the singular. Indeed, some American speakers regard the plural as incorrect. In British English, the plural is much more widespread, though when the collective noun is seen as a single thing and not a collection of individuals, then the singular is preferred, so British speakers might say that a company is being sold, but may use the plural when thinking about the company's operations. The BBC states its policy is to use the plural when talking about a team, etc. In Australian English, the singular is becoming more common than the plural, but both are used.
There is a lot of debate at the moment on whether the Trinity College London TEFL (TESOL) Certificate courses offered by Windsor TEFL are accredited.