by chance

She told the BBC how she came across the crash scene by chance while returning from a hospital appointment.

Purely by chance, Janice stumbled across a post on Facebook from Mr Potter's farm, warning people about the scam.

Ahead of her surgery McCall had explained how the tumour had been found by chance.

Then the campaign discovered, again by chance, what could be an official order to destroy medical records.

Emma moved away to be with family in rural Wales - and then by chance during a therapy session, she said someone spotted she might have autism instead.