[Infrared white balance]

Sure. Included are pictures taken with several different filters and some fullspectrum shots too.

DSCF6517.afphoto DSCF0344.RAF DSCF0372.RAF DSCF0618.RAF DSCF0663.RAF DSCF9094.RAF DSCF0169.RAF DSCF0176.RAF DSCF7437.RAF

[Infrared white balance]

1 minute ago, NotMyFault said:

Worthless maybe a bit exaggerated conclusion. There are several ways to achieve white balance by other methods (curves, levels, …).

IR Photography is more a creative discipline, not a science. 

While it is a creative discipline, setting white balance is not part of the creative bit (because this is the starting point, literally setting a reference for what white is, from which any other edits are to be applied and it is meant to make a picture look as neutral as possible).
As a side note, I'd like to mention it's possible to set it correctly in the develop persona using overlays (for example making a gradient that fills the entire picture and adjusting it twice). This is not ideal but it works for now.

[Infrared white balance]

I'm also having an issue with infrared white balance - the range is just too small for proper correction currently.

[(Affinity Photo 2) The white balance value range in the Develop Persona is too small]

When taking pictures in IR, if the photographer doesn't set the white balance in camera and intends to change it via Affinity Photo 2, they come across the issue where the white balance tool in the Develop Persona of Affinity Photo 2 does not have enough range to correct colour casts on the whites in an image. (even when using the picker tool, which extends it slightly)

I've attached an example shot I took with an 'ultrablue' filter, the second image corrected using another software, and the first using Affinity Photo 2. There is also the original .RAF raw.
The 'correct' white balance that I'm looking for is one where the white of the walls on the parking lot buildings (and the stickers on the recycling containers on the bottom right) is as close as it can be to neutral (no tint).

Using the picker tool on the white part of the wall, the tint gets pegged at 100%, meaning it does not have enough range to fully remove the colour cast. This is a huge issue, as the user cannot properly set the white balance in a lot of pictures. Moreover, even if the user does set the white balance in camera, and it is closer to the intended one but still needs adjustments, when enabling the white balance adjustment in the Develop Persona, it oftentimes gets worse due to the range being less than that of the camera's.

My suggestion to this issue is: add a checkbox that would enable an extended range of values to be edited. (This would also help people who white balance old negatives.)

DSCF6517.RAF