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I'd also define your SnakeSegment structure as a class, instead, like this:

Using constants rather than macros adds readability to your code, and it has all the properties of a normal variable, e.g, a size, a type, linkage, etcetera. A macro has none of those.

I'd also define your SnakeSegment structure as a class instead, as seen below.

It's also worth noting, if you ever want to add more methods to this class in the future, you should define two separate files for it, classname.cpp, and classname.h. classname.h should contain the class declaration and the function/constructor signatures inside it, and classname.cpp should include classname.h and implement the functions/constructors.

void DisplayPlane(); void NormalisePlane(); void SnakeInit(); void FoodInit(); void Move(); void DeleteLastSnakeSegment(); bool HasEatenFood(); void WipeConsole(); bool Won(); bool Lost(); 

void DisplayPlane(); void NormalisePlane(); void SnakeInit(); void FoodInit(); void Move(); void DeleteLastSnakeSegment(); bool HasEatenFood(); void WipeConsole(); bool Won(); bool Lost(); 

These are not really necessary, they can be removed.

These are a bit of code smell, and are not really necessary, they can be removed. (You may have to define these functions again above main.)