[Infer LUT confusion]

Thank you so much for your replies, the HALD image has now worked almost perfectly on many of my photos, I just have to tweak a few little things but that's all fine in my book. Again, thank you for your time. I am really enjoying getting to know both Affinity Photo and Affinity Designer. 

[Infer LUT confusion]

Hiya, 

I'm really struggling to wrap my head around the 'infer LUT' adjustment. I trialed a plugin that I eventually decided wasn't worth the money. There was 1 filter on it that I love though, so I am trying to emulate it. 

I would've thought this is where the Infer LUT option would help me out here, but I am really struggling to make it work. 

Here is one of my photos untouched:

Here is the filter I love using: 

Here is another untouched photo:

Here is the infer LUT adjustment using the two first photos:

 

So what is going on here? Can anyone suggestion another way of doing this? I have been going round in circles trying to emulate this filter. If this isn't what infer LUT is for, then what is it for?

Thanks in advance!