Apple crumble cheesecake

Name: Apple crumble cheesecake
Prep time: 30 min
Cook time: 1 h
Total time: 1 h 30 min
Cuisine: European, British
Ingredients: 250gDigestive biscuits (crushed); 100gButter (unsalted) (softened); 1Apple(s) (bramley, peeled, cored and thinly sliced); 0.5 tspNutmeg (grated); 500gMascarpone cheese; 500gCream cheese (full fat); 120gSilver Spoon Caster Sugar; 1 tbspVanilla bean paste; 150mlSour cream; 4Egg(s) (free range) (medium); 110gAllinson's Plain White Flour; 110gBillington's Unrefined Light Muscovado Sugar; 1 tspCinnamon; 50gUnsalted Butter (softened); 1 tspMilk (whole)