A longer period may be allowed in exceptional circumstances.

The city decided it would allow public assembly only in controlled circumstances.

A. The baseball rule book allows for a so-called "fourth out" in certain circumstances, and this was one of them.

The government has said fees of more than £6,000 will be allowed only in "exceptional circumstances".

It also defines where rebates of duty are allowed in certain circumstances.

But it allowed for periods up to 25 years in several specific circumstances, including those involving information on weapons of mass destruction.

Separation from bed and board was allowed in exceptional circumstances, usually adultery.

But the law was changed to allow extradition in certain circumstances.

We are prepared to allow flexibility in such circumstances.

Claims outside those areas would be allowed only in certain circumstances.