Under the Standing Orders of each House the JCSI may draw an SI to the special attention of both Houses on any of the grounds specified:
Grounds
The JCSI assesses the technical qualities of each instrument that falls within its remit and to decide whether to draw the special attention of each House to any instrument on one or more of the following grounds:
(i) that it imposes, or sets the amount of, a charge on public revenue or that it requires payment for a licence, consent or service to be made to the Exchequer, a government department or a public or local authority, or sets the amount of the payment;
(ii) that its parent legislation says that it cannot be challenged in the courts;
(iii) that it appears to have retrospective effect without the express authority of the parent legislation;
(iv) that there appears to have been unjustifiable delay in publishing it or laying it before Parliament;
(v...