Mad Jock,
I really know what a visual approach is...be sure...and above all as I said I really know that's not an IAP and there's no MAP when you decide to proceed visual...that's the rule...in France, it seems to be the same in Canada and in all other ICAO region...what you decide to do in case of G/A during your visual with no more instruction from ATC is up to you...I maintain, you must fly under clearance, if into CAS, clearance done by ATC or received on your request after having been cleared visual...
This problem of G/A during visual is a worldwide ATC and PILOTS problem since the visual approach began...try other forum and sure you will see same threads...with same questions...same answers...
A bientôt on freq....