Excellent input thanks gents.
Wouldst love to have the FAA reg reference / URL.
May later post the background to the query. Your responses are now in responsible hands - as we speak. Pleased to say that you share my views on intervention in the interests of safety. Sometimes that's a difficult call and not without undeserved "payback". Perhaps ATCO's need an LSO style PLAT camera doing some continuous recording of the runway vista - from your eagle-eye viewpoint.