<<i ask if any of you seriously believe that a fast jet can be maneuvered in a manner to avoid other jets out there while going back for an immediate landing at say...heathrow,schipoll..frankfurt.>>
But jets aren't normally "fast" in such circumstances. I'm confident that ATC could handle such a situation; well they certainly could at Heathrow. Been there, done it, got the tee-shirt.....
As to the original question - standard procedures for such events are laid down in the AIP.