"legislative gap" is a correct and usable term in written English.
You could use it to refer to a gap or discrepancy between existing laws or regulations and a set of desired standards or expectations. For example: "Many countries have struggled to close the legislative gap between current regulations and climate change goals."
Following the ECJ strike down, the U.K. government passed "emergency" interception legislation, aka DRIPA, to fill the legislative gap (DRIPA has a sunset clause, hence attempts to inject similar measures in the separate counter-terrorism bill).
An earlier (temporary) authorization for ridesharing to operate in Philadelphia expired at the end of September, so the cease-and-desist order is falling within that legislative gap.
While the court upheld the man's acquittal, it did, however, nudge the government towards taking action to fix the legislative gap.
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Still, experts see the law as an important step in closing a legislative gap that allowed men who groped women or even ejaculated on them in public to get off with a fine.
Lona Laymon explained La Cañada needs to get aesthetic standards on the books now, to the extent allowable and through an urgency ordinance, to prevent creating a legislative gap companies could take advantage of.
As a result of this differentiation, the existence of legislative gaps or omissions is noticed.
On top of this, there are technical and legislative gaps in the institutional framework to implement any of the above mentioned issues.
"We don't believe there is a need for specific new rules on shale gas but if legislative gaps are identified we are happy to analyse the situation and co-operate with policy makers on finding the best way forward," said Alessandro Torello, a spokesman for the International Association of Oil and Gas producers.
Last month a House of Lords committee recommended an overarching super regulator be established to plug any legislative gaps and/or handle overlaps in rules on internet platforms, arguing that "a new framework for regulatory action" is needed to handle the digital world.
When asked about the role of research in informing policy to protect children, high-level government officials quoted political inertia, increasing cuts and multiple legislative gaps as barriers to policy development and implementation.
