The Canadian way
Hi Mad Jock,
In Canada, a visual approach does not have a missed approach portion and the pilot is expected to continue VFR and obtain another IFR clearance before entering cloud again, whether laterally or vertically.
At a controlled airport, the tower controller will usually provide some guidance in the event of a missed approach so there should be no concern there. At an uncontrolled airfield, however, the pilot is supposed to somehow make contact with ATC again and request an IFR altitude before going into IMC.
So if a pilot overshoots at un uncontrolled airport for anything other than weather, I expect him to fly a standard VFR circuit. If it's weather related then we'll have to figure it out when he calls.
That's the way we apply it on this side of the North Atlantic.
Cheers,
Felix