1. There is a two stage process to a Judicial Review application. The first stage, the leave stage, is where the applicant, such as your father in law, seeks the permission of the court to bring his action. The prospects of success at this stage are about 40-50%. However, even if successful, it merely entitles the applicant to bring his case. The second stage is the hearing of the actual Judicial Review application. Here the prospects of success are 3-5%. Very low.
2. The reason for the very low success rates include the fact that there is a hostile judicial attitude towards persons seeking to obtain visas or citizenship in the UK who don't fall within the recognised categories, for which UK Visas have not granted a visa. There is a large element of deference to the decisions of the HOme Office.
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