Are you certain of that?
Hypothetical and anecdotal:
Most of the time, higher level decision makers do not have the necessary detailed experise or information to adequately dissect a situation - whether it be eliminating Iowa, or how to man a new office responsible for paper clip procurement. Staff action officers (and their supporting staff) who have day to day responsibility are tasked to analyze a "situation" along with the desired effects of a potential outcome. A series of courses of action are developed, usually never more than 4 or 5, as anything past that usually ends up as a variation of one of the others. Effects based planning, cause and effect. Potential results, both pro and con. One or two are usually pretty well throw aways, but are included as they both WILL address the issue, and provide a comparison to other, generally more reasonable and tenable courses of action. These are briefed to whatever decision making committee is carged with picking. Usually, this is done in Powerpoint, with hard copy of the brief and what amounts to note pages and information packets to each participant for reference. When working with allies, it's normal to provide those allies with the same package, and even include them in the briefing/decision process. When all is said and done, a particular course may be chosen, might be modified, or all might be rejected for one reason or another and everyone goes back to the well. But, everyone goes back to the well better informed for the next go around.
Could it be possible, if there is ANYTHING to this at all, that somebody leaked the info package/briefing slides that could have included "Blow the SOB Up" as a designed throw away option (to give perspective)? And, once a left wing sensationalist tabloid gets their hands on it, embellishment takes over? Perhaps the concern within the British government is not trying to "cover up" nefarious intentions of the governments in question, but the fact that a sensitive and classified decision briefing was compromised?
This also periferally relates to "Sharing Information with Congress".