(ii) Irrationality/Unreasonableness a) The Respondent’s decision amounts to a denial of the Applicant’s legitimate expectation. b) The Respondent had exercised its authority arbitrarily and/or mechanically without applying its mind to the facts and circumstances of the Applicant; and c) The Respondent failed to give any valid justification, reason or basis for its decision to issue the Bill of Demand. Law pertaining to Judicial Review [15] Prior to considering and analyzing this application, it would be prudent for this court to be reflect on the legal principles relating to judicial review. [16] Order 53 Rules of Court 2012 provides for the procedures for an application for judicial review. [17] The grounds for judicial review are illegality, irrationality, procedural impropriety and proportionality. These grounds were laid down by Lord Diplock in the case of Council of Civil Service Unions & Ors v Minister of Civil Service [1985] AC 374 which was adopted by the Federal Court in the case of R Rama Chandran v The Industrial Court of Malaysia & Anor [1997] 1 MLJ 145 as follows: “In this context, it is useful to note how Lord Diplock (at pp 410– 411) defined the three grounds of review, to wit, (i) illegality, (ii) irrationality, and (iii) procedural impropriety. This is how he put it: By 'illegality' as a ground for Judicial Review I mean that the decision maker must understand directly the law that regulates his decision making power and must give effect to it. Whether he has or not is par excellence a justiciable question to be decided, in the event of a dispute, by those persons, the judges, by whom the judicial power of the state is exerciseable. By 'irrationality' I mean what can by now be succinctly referred to as 'Wednesbury unreasonableness' (see Associated Provincial Picture Houses Ltd v Wednesbury Corp [1948] 1 KB 223). It applies to a decision which is so outrageous in its defiance of logic or of accepted moral standards that no sensible person who had applied his mind to the question to be decided could have arrived at it. Whether a decision falls within this category is a question that judges by their training and experience should be well equipped to answer, or else there would be something badly wrong with our judicial system. To justify the courts' exercise of this role, resort I think is today no longer needed to Viscount Radcliffe's ingenious explanation in Edwards v Bairstow [1956] AC 14, of irrationality as a ground for a court's reversal of a decision by ascribing it to an inferred though undefinable mistake of law by the decision maker. 'Irrationality' by now can stand on its own feet as an accepted ground on which a decision may be attacked by Judicial Review. I have described the third head as 'procedural impropriety' rather than failure to observe basic rules of natural justice or failing to act with procedural fairness towards the person who will be affected by the decision. This is because susceptibility to Judicial Review under this head covers also failure by an administrative tribunal to observe procedural rules that are expressly laid down in the legislative instrument by which its jurisdiction is conferred, even where such failure does not involve any denial of natural justice. Lord Diplock also mentioned 'proportionality' as a possible fourth ground of review which called for development.” Analysis and Findings [18] Based on the principles of law relating to judicial review, this court will proceed to examine the application before this court. [19] An audit was conducted by the Respondent on the Applicant on 6.12.2017. As a result of the audit, the Respondent found the Applicant had underpaid or understates goods and services tax of total RM 23,932,158.69. The Respondent issued a Bill of Demand dated 8.3.2019 for the tax due. This is the root of this judicial review application. [20] The GST Act has since been repealed via Goods and Services Tax (Repeal) Act 2018 [Act 805]. Nonetheless, section 4 (1) (b) of the Goods and Services Tax (Repeal) Act 2018 [Act 805] provides for continuation of liability where tax is recoverable under the repealed Act as if the repealed Act had not been repealed. On this basis, the Respondent contend that they are able to issue the Bill of Demand to the Applicant. [21] This court agrees with the contention of the Respondent that section 4 (1) (b) of the Goods and Services Tax (Repeal) Act 2018 enables the Respondent to issue the Bill of Demand. Illegality