I guessed the Tiffy FCS wasn't programmed to drop 540's.....unless somebody forks out a wadd of dosh for the software!!! But the GR4's FCS can handle 540's!!! Hence the suggestion for a mixed (close) formation in which the Tonka WSO tells the Tiffy pilot to pickle the weapon by radio (which should get the bomb into the Laser basket with enough energy), and then guides the weapon on to the target. This method is by no ways perfect, but it should work, of course as long as a Tiffy can manually pickle a weapon!!!