Basically anything that "detects" will eventually be outlawed whether it's laser or radar. So GPS systems can't ever be outlawed, unless they outlaw Nav systems as well. However RA2 and similar are in a grey area as they have a laser detector built in, so there would need to be some mechanism to disable this element.
Laser diffusers (or scramblers) have never been legal, but they have now increased the severity of the offence if caught using one.
Detectors are now attracting attention as a feeble reason for the continued increase in road deaths despite the ludicrous misguided safety camera campaigns. i.e. the death toll is still rising because everyone is using detectors to avoid detection. How unbelievably naive are these people? Detectors perform the same useless function as a safety camera, i.e. slowing people down at a supposed accident black spot, so how anyone can conclude that they are reponsible for skewing the figures is beyond me. But while this campaign continues to line the pockets of "safety units" all over the UK, without catching any of the real targets (the uninsured, the unroadworthy and the plain mad bikers) they have to justify it somehow.
The message is clear, if you're p*ssed up driving a clapped out lorry with no insurance, then as long as you don't speed you're perfectly safe, even when you cross the central reservation and take out a family of four (who are probably speeding so deserve it).