Mera Head Phat Ja Rha hai - Judicial Review on Administrative Action

Maine ye question 3 baar padha aur abhi bhi samajh nahi aaya. Kya judicial review ke dauran administration ke actions ko set aside karna compulsory hai ya phir yeh court ki discretion hai? Maine Draycott (1986) mein yeh pehla case padha tha jaha par judicial review ke result se administrative action set aside ho gaya tha, lekin fir se yeh case Boddingtons (1999) mein padha jab yeh pata laga ki judicial review ke result se administrative action set aside nahi ho sakta hai if uske pas doosra mehtod hai. Maine socha ki kya main galat hoon ya phir ye rules galat hai? Koi batayega, please!