once-in-a-lifetime

He said: "This is a once in a lifetime opportunity to actually start that reform that policing needs, and it will be a missed opportunity if it's not properly funded from the start."

The proposed legislation was a "once in a lifetime opportunity" for the government to "shift the dial just slightly in favour of working people", she said.

"A job like this is really once in a lifetime, so just go for it."

It is a test to be taken once in a lifetime and will be overseen by member federations.

Mr and Ms Foreman were arrested by Iranian authorities in January while on a "once in a lifetime" trip around the world.