The unknown effect of excessive folic acid consumption on cancer risk also caused concern.

The chaos of haphazard buildings and ill-conceived new arterial roads were already causing concern and we were often called in to advise on remedial planting.

Tourists taking selfies and groups of laughing visitors have caused concern in the past.

Although some academy chains have done well, a small number have less convincing results and have caused concern within the department.

Regular speedo checks should not cause concern for a competent driver.