The phrase "a formal advisory" is correct and usable in written English.
It can be used in contexts where you are referring to an official recommendation or guidance provided in a formal manner.
Example: "The committee issued a formal advisory regarding the new safety protocols that all employees must follow."
Alternatives: "an official recommendation" or "a formal notice".
So why did UNAids award this group a formal advisory role?
In the 1980s he conducted research into victims of crime in several London boroughs, and acted in a formal advisory capacity to the Metropolitan Police Authority.
The commission contends that after the second call, one of its officials advised Ms. Johnson that the campaign committee needed to seek a formal advisory opinion from the commission.
On Friday a spokesman for Turnbull again confirmed that "in November 2015, prime minister Turnbull wrote to all BAC members thanking for them for their service and informing them a formal advisory group will no longer meet".
Experts have said that lacking a formal advisory from the city, doctors may not have had sufficient information to recognize the ailments connected to 9/11, or to prescribe the proper treatment.
I'm an angel with 17 portfolio companies and each one I take a formal advisory role.
Though the Center for Security Policy certainly appears to have influence on Trump's campaign policies, it would be wrong to see him in any formal advisory capacity.
But those in opposing camps -- advisers themselves, of course, with a clear interest in the perceived importance of their work -- insist that the lack of a more formal advisory structure in the Bradley campaign is a problem.
The National Institutes of Health have issued a formal clinical advisory to doctors suggesting that they focus on systolic pressure in older adults.
The warning from the European Union health commissioner, Androulla Vassiliou, was not intended as a formal travel advisory, her spokeswoman, Nina Papadoulaki, said later.
Turnbull's spokesman said the new prime minister, who has strong personal links to the business community, was still considering whether he needed a formal business advisory council.
