As you enter the car park reduce your speed and watch out for pedestrians and other vehicles reversing out of spaces. Find your space and drive in the centre of the available space, this gives you more room to perform the manouevre. Pull up next to the space and then count 3 lines forward from the space (2 spaces) pull forward until the 3rd line is roughly in line with your elbow when holding the wheel.

Put the car immediately into reverse to let cars behind know you are going into the space. Have a good look around for pedestrians and ALWAYS look over your left shoulder through the back window to ensure you see in your peripheral vision (mirrors dont see everything).  As soon as the car begins to move turn full lock in the direction of your space. You should see the line of the bay you are reversing into appear in your blind spot mirror as shown opposite.

Keep reversing and you should see the other side of the bay appear in the opposite mirror, Keep reversing whilst making observations all around. When you notice your front end is pointing straight ahead and both lines are parallel to the side of your car straighten your wheel. You can stop and do this if you like but be aware it can cause extra wear to your tyres and is called dry steering.

Once your mirrors are sitting on top of the line you have reversed far enough. You can also use blind spot mirrors to view your rear wheel.

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Recommendation: Buy some adjustable blind spot mirrors for a few quid on ebay here.