I understand that the US went its own way when the UK pressed on with the JP233 as they realised that having to drop the things from a low level overflight of the target was far too risky.
Although the runway cratering worked satisfactorily in GW1, I always wondered whether the Eastern European high velocity water spraying tank used later to put out oil fires was originally designed to thwart the JPs' so-called area denial mines which were supposed to lie around the cratered runway, hampering repair efforts. All the enemy would have had to do would be to start up the old (T34?) tank with the water container and jet engine on the back and simple hose any mines out of the way.....
When the JPs were no longing being used for low level attacks, some 'senior RAF Officer' not in the command chain allegedly wrote a letter stating that future of the Tornado / JP233 would be called into question after the war if it wasn't used more against other targets. In other words, this tosseur was more interested in politico-military posturing than the theatre commanders' balanced assessemnt of risk and effectiveness. This made Sir Peter de la Billiere 'extremely angry' and a 'heated exchange' continued with the mad MoD-box until attempts to resume non-essential low level attacks faded away. The whole saga is well documented in Sir Peter's book Storm Command - spookily enough on page 233!