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I tried to find a definitive answer for this question recently, and failed!:doh:

I "think" that 5F should be used to cover all variants whilst the following are full model designators;

-5F1 ... Hatchback
-5F5 ... SC (3 door)
-5F8 ... ST (Estate)

Based on nothing more my car's factory build sticker and a couple of sites that use these designators.

Examples here if you look at the selector on the left of the page and here.
 
I tried to find a definitive answer for this question recently, and failed!:doh:

I "think" that 5F should be used to cover all variants whilst the following are full model designators;

-5F1 ... Hatchback
-5F5 ... SC (3 door)
-5F8 ... ST (Estate)

Based on nothing more my car's factory build sticker and a couple of sites that use these designators.

Examples here if you look at the selector on the left of the page and here.

Thanks for the reply. After some more digging, it would appear you are correct. The site I was originally on only listed 5F and 5F1.