You can unlock the Mobile Homing Missile trophy in The Grand Tour Game during Season 3 > Episode 8 > Scene 8.
Go for the trophy on lap two or three, as you'll be travelling much faster than the rolling start you get on lap one. To get a lap time of under 26 seconds, make sure you keep the lap clean, avoiding any walls, and try to keep your cornering tight to the inside. Use the Square button on slower corners to drift around them smoothly.